softfloat: Refactor code handling various rounding modes
Refactor the code in various functions which calculates rounding increments given the current rounding mode, so that instead of a set of nested if statements we have a simple switch statement. This will give us a clean place to add the case for the new tiesAway rounding mode. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Peter Maydell
parent
14c9a07eb9
commit
dc355b764d
405
fpu/softfloat.c
405
fpu/softfloat.c
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@ -42,6 +42,9 @@ these four paragraphs for those parts of this code that are retained.
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#include "fpu/softfloat.h"
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/* We only need stdlib for abort() */
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#include <stdlib.h>
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/*----------------------------------------------------------------------------
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| Primitive arithmetic functions, including multi-word arithmetic, and
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| division and square root approximations. (Can be specialized to target if
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@ -106,20 +109,21 @@ static int32 roundAndPackInt32( flag zSign, uint64_t absZ STATUS_PARAM)
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roundingMode = STATUS(float_rounding_mode);
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roundNearestEven = ( roundingMode == float_round_nearest_even );
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roundIncrement = 0x40;
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if ( ! roundNearestEven ) {
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if ( roundingMode == float_round_to_zero ) {
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roundIncrement = 0;
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}
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else {
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roundIncrement = 0x7F;
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if ( zSign ) {
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if ( roundingMode == float_round_up ) roundIncrement = 0;
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}
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else {
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if ( roundingMode == float_round_down ) roundIncrement = 0;
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}
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}
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switch (roundingMode) {
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case float_round_nearest_even:
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roundIncrement = 0x40;
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break;
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case float_round_to_zero:
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roundIncrement = 0;
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break;
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case float_round_up:
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roundIncrement = zSign ? 0 : 0x7f;
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break;
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case float_round_down:
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roundIncrement = zSign ? 0x7f : 0;
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break;
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default:
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abort();
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}
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roundBits = absZ & 0x7F;
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absZ = ( absZ + roundIncrement )>>7;
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@ -155,19 +159,21 @@ static int64 roundAndPackInt64( flag zSign, uint64_t absZ0, uint64_t absZ1 STATU
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roundingMode = STATUS(float_rounding_mode);
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roundNearestEven = ( roundingMode == float_round_nearest_even );
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increment = ( (int64_t) absZ1 < 0 );
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if ( ! roundNearestEven ) {
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if ( roundingMode == float_round_to_zero ) {
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increment = 0;
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}
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else {
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if ( zSign ) {
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increment = ( roundingMode == float_round_down ) && absZ1;
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}
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else {
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increment = ( roundingMode == float_round_up ) && absZ1;
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}
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}
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switch (roundingMode) {
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case float_round_nearest_even:
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increment = ((int64_t) absZ1 < 0);
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break;
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case float_round_to_zero:
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increment = 0;
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break;
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case float_round_up:
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increment = !zSign && absZ1;
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break;
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case float_round_down:
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increment = zSign && absZ1;
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break;
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default:
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abort();
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}
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if ( increment ) {
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++absZ0;
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@ -206,17 +212,21 @@ static int64 roundAndPackUint64(flag zSign, uint64_t absZ0,
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roundingMode = STATUS(float_rounding_mode);
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roundNearestEven = (roundingMode == float_round_nearest_even);
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increment = ((int64_t)absZ1 < 0);
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if (!roundNearestEven) {
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if (roundingMode == float_round_to_zero) {
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increment = 0;
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} else if (absZ1) {
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if (zSign) {
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increment = (roundingMode == float_round_down) && absZ1;
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} else {
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increment = (roundingMode == float_round_up) && absZ1;
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}
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}
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switch (roundingMode) {
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case float_round_nearest_even:
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increment = ((int64_t)absZ1 < 0);
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break;
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case float_round_to_zero:
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increment = 0;
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break;
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case float_round_up:
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increment = !zSign && absZ1;
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break;
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case float_round_down:
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increment = zSign && absZ1;
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break;
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default:
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abort();
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}
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if (increment) {
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++absZ0;
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@ -354,20 +364,22 @@ static float32 roundAndPackFloat32(flag zSign, int_fast16_t zExp, uint32_t zSig
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roundingMode = STATUS(float_rounding_mode);
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roundNearestEven = ( roundingMode == float_round_nearest_even );
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roundIncrement = 0x40;
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if ( ! roundNearestEven ) {
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if ( roundingMode == float_round_to_zero ) {
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roundIncrement = 0;
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}
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else {
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roundIncrement = 0x7F;
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if ( zSign ) {
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if ( roundingMode == float_round_up ) roundIncrement = 0;
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}
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else {
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if ( roundingMode == float_round_down ) roundIncrement = 0;
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}
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}
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switch (roundingMode) {
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case float_round_nearest_even:
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roundIncrement = 0x40;
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break;
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case float_round_to_zero:
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roundIncrement = 0;
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break;
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case float_round_up:
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roundIncrement = zSign ? 0 : 0x7f;
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break;
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case float_round_down:
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roundIncrement = zSign ? 0x7f : 0;
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break;
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default:
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abort();
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break;
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}
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roundBits = zSig & 0x7F;
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if ( 0xFD <= (uint16_t) zExp ) {
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@ -536,20 +548,21 @@ static float64 roundAndPackFloat64(flag zSign, int_fast16_t zExp, uint64_t zSig
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roundingMode = STATUS(float_rounding_mode);
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roundNearestEven = ( roundingMode == float_round_nearest_even );
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roundIncrement = 0x200;
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if ( ! roundNearestEven ) {
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if ( roundingMode == float_round_to_zero ) {
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roundIncrement = 0;
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}
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else {
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roundIncrement = 0x3FF;
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if ( zSign ) {
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if ( roundingMode == float_round_up ) roundIncrement = 0;
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}
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else {
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if ( roundingMode == float_round_down ) roundIncrement = 0;
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}
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}
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switch (roundingMode) {
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case float_round_nearest_even:
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roundIncrement = 0x200;
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break;
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case float_round_to_zero:
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roundIncrement = 0;
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break;
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case float_round_up:
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roundIncrement = zSign ? 0 : 0x3ff;
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break;
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case float_round_down:
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roundIncrement = zSign ? 0x3ff : 0;
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break;
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default:
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abort();
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}
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roundBits = zSig & 0x3FF;
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if ( 0x7FD <= (uint16_t) zExp ) {
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@ -719,19 +732,20 @@ static floatx80
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goto precision80;
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}
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zSig0 |= ( zSig1 != 0 );
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if ( ! roundNearestEven ) {
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if ( roundingMode == float_round_to_zero ) {
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roundIncrement = 0;
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}
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else {
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roundIncrement = roundMask;
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if ( zSign ) {
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if ( roundingMode == float_round_up ) roundIncrement = 0;
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}
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else {
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if ( roundingMode == float_round_down ) roundIncrement = 0;
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}
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}
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switch (roundingMode) {
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case float_round_nearest_even:
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break;
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case float_round_to_zero:
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roundIncrement = 0;
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break;
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case float_round_up:
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roundIncrement = zSign ? 0 : roundMask;
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break;
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case float_round_down:
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roundIncrement = zSign ? roundMask : 0;
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break;
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default:
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abort();
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}
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roundBits = zSig0 & roundMask;
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if ( 0x7FFD <= (uint32_t) ( zExp - 1 ) ) {
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@ -778,19 +792,21 @@ static floatx80
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if ( zSig0 == 0 ) zExp = 0;
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return packFloatx80( zSign, zExp, zSig0 );
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precision80:
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increment = ( (int64_t) zSig1 < 0 );
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if ( ! roundNearestEven ) {
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if ( roundingMode == float_round_to_zero ) {
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increment = 0;
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}
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else {
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if ( zSign ) {
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increment = ( roundingMode == float_round_down ) && zSig1;
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}
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else {
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increment = ( roundingMode == float_round_up ) && zSig1;
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}
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}
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switch (roundingMode) {
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case float_round_nearest_even:
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increment = ((int64_t)zSig1 < 0);
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break;
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case float_round_to_zero:
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increment = 0;
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break;
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case float_round_up:
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increment = !zSign && zSig1;
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break;
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case float_round_down:
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increment = zSign && zSig1;
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break;
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default:
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abort();
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}
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if ( 0x7FFD <= (uint32_t) ( zExp - 1 ) ) {
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if ( ( 0x7FFE < zExp )
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@ -820,16 +836,21 @@ static floatx80
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zExp = 0;
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if ( isTiny && zSig1 ) float_raise( float_flag_underflow STATUS_VAR);
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if ( zSig1 ) STATUS(float_exception_flags) |= float_flag_inexact;
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if ( roundNearestEven ) {
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increment = ( (int64_t) zSig1 < 0 );
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}
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else {
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if ( zSign ) {
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increment = ( roundingMode == float_round_down ) && zSig1;
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}
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else {
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increment = ( roundingMode == float_round_up ) && zSig1;
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}
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switch (roundingMode) {
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case float_round_nearest_even:
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increment = ((int64_t)zSig1 < 0);
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break;
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case float_round_to_zero:
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increment = 0;
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break;
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case float_round_up:
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increment = !zSign && zSig1;
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break;
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case float_round_down:
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increment = zSign && zSig1;
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break;
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default:
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abort();
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}
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if ( increment ) {
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++zSig0;
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@ -1029,19 +1050,21 @@ static float128
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roundingMode = STATUS(float_rounding_mode);
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roundNearestEven = ( roundingMode == float_round_nearest_even );
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increment = ( (int64_t) zSig2 < 0 );
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if ( ! roundNearestEven ) {
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if ( roundingMode == float_round_to_zero ) {
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increment = 0;
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}
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else {
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if ( zSign ) {
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increment = ( roundingMode == float_round_down ) && zSig2;
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}
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else {
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increment = ( roundingMode == float_round_up ) && zSig2;
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}
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}
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switch (roundingMode) {
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case float_round_nearest_even:
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increment = ((int64_t)zSig2 < 0);
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break;
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case float_round_to_zero:
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increment = 0;
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break;
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case float_round_up:
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increment = !zSign && zSig2;
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break;
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case float_round_down:
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increment = zSign && zSig2;
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break;
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default:
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abort();
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}
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if ( 0x7FFD <= (uint32_t) zExp ) {
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if ( ( 0x7FFD < zExp )
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@ -1089,16 +1112,21 @@ static float128
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zSig0, zSig1, zSig2, - zExp, &zSig0, &zSig1, &zSig2 );
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zExp = 0;
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if ( isTiny && zSig2 ) float_raise( float_flag_underflow STATUS_VAR);
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if ( roundNearestEven ) {
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increment = ( (int64_t) zSig2 < 0 );
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}
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else {
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if ( zSign ) {
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increment = ( roundingMode == float_round_down ) && zSig2;
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}
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else {
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increment = ( roundingMode == float_round_up ) && zSig2;
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}
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switch (roundingMode) {
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case float_round_nearest_even:
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increment = ((int64_t)zSig2 < 0);
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break;
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case float_round_to_zero:
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increment = 0;
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break;
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case float_round_up:
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increment = !zSign && zSig2;
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break;
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case float_round_down:
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increment = zSign && zSig2;
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break;
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default:
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abort();
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}
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}
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}
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@ -1737,7 +1765,6 @@ float32 float32_round_to_int( float32 a STATUS_PARAM)
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flag aSign;
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int_fast16_t aExp;
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uint32_t lastBitMask, roundBitsMask;
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int8 roundingMode;
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uint32_t z;
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a = float32_squash_input_denormal(a STATUS_VAR);
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@ -1769,15 +1796,27 @@ float32 float32_round_to_int( float32 a STATUS_PARAM)
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lastBitMask <<= 0x96 - aExp;
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roundBitsMask = lastBitMask - 1;
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z = float32_val(a);
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roundingMode = STATUS(float_rounding_mode);
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if ( roundingMode == float_round_nearest_even ) {
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switch (STATUS(float_rounding_mode)) {
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case float_round_nearest_even:
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z += lastBitMask>>1;
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if ( ( z & roundBitsMask ) == 0 ) z &= ~ lastBitMask;
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}
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else if ( roundingMode != float_round_to_zero ) {
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if ( extractFloat32Sign( make_float32(z) ) ^ ( roundingMode == float_round_up ) ) {
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if ((z & roundBitsMask) == 0) {
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z &= ~lastBitMask;
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}
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break;
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case float_round_to_zero:
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break;
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case float_round_up:
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if (!extractFloat32Sign(make_float32(z))) {
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z += roundBitsMask;
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}
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break;
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case float_round_down:
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if (extractFloat32Sign(make_float32(z))) {
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z += roundBitsMask;
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}
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break;
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default:
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abort();
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}
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z &= ~ roundBitsMask;
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if ( z != float32_val(a) ) STATUS(float_exception_flags) |= float_flag_inexact;
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@ -3120,7 +3159,6 @@ static float32 roundAndPackFloat16(flag zSign, int_fast16_t zExp,
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int maxexp = ieee ? 29 : 30;
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uint32_t mask;
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uint32_t increment;
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int8 roundingMode;
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bool rounding_bumps_exp;
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bool is_tiny = false;
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@ -3138,8 +3176,7 @@ static float32 roundAndPackFloat16(flag zSign, int_fast16_t zExp,
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mask = 0x00001fff;
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}
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roundingMode = STATUS(float_rounding_mode);
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switch (roundingMode) {
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switch (STATUS(float_rounding_mode)) {
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case float_round_nearest_even:
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increment = (mask + 1) >> 1;
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if ((zSig & mask) == increment) {
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@ -3430,7 +3467,6 @@ float64 float64_round_to_int( float64 a STATUS_PARAM )
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flag aSign;
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int_fast16_t aExp;
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uint64_t lastBitMask, roundBitsMask;
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int8 roundingMode;
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uint64_t z;
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a = float64_squash_input_denormal(a STATUS_VAR);
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@ -3463,15 +3499,27 @@ float64 float64_round_to_int( float64 a STATUS_PARAM )
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lastBitMask <<= 0x433 - aExp;
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roundBitsMask = lastBitMask - 1;
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z = float64_val(a);
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roundingMode = STATUS(float_rounding_mode);
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if ( roundingMode == float_round_nearest_even ) {
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z += lastBitMask>>1;
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if ( ( z & roundBitsMask ) == 0 ) z &= ~ lastBitMask;
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}
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else if ( roundingMode != float_round_to_zero ) {
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if ( extractFloat64Sign( make_float64(z) ) ^ ( roundingMode == float_round_up ) ) {
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switch (STATUS(float_rounding_mode)) {
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case float_round_nearest_even:
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z += lastBitMask >> 1;
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if ((z & roundBitsMask) == 0) {
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z &= ~lastBitMask;
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}
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break;
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case float_round_to_zero:
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break;
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case float_round_up:
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if (!extractFloat64Sign(make_float64(z))) {
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z += roundBitsMask;
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}
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break;
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case float_round_down:
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if (extractFloat64Sign(make_float64(z))) {
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z += roundBitsMask;
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}
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break;
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default:
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abort();
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}
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z &= ~ roundBitsMask;
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if ( z != float64_val(a) )
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@ -4699,7 +4747,6 @@ floatx80 floatx80_round_to_int( floatx80 a STATUS_PARAM )
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flag aSign;
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int32 aExp;
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uint64_t lastBitMask, roundBitsMask;
|
||||
int8 roundingMode;
|
||||
floatx80 z;
|
||||
|
||||
aExp = extractFloatx80Exp( a );
|
||||
|
|
@ -4740,15 +4787,27 @@ floatx80 floatx80_round_to_int( floatx80 a STATUS_PARAM )
|
|||
lastBitMask <<= 0x403E - aExp;
|
||||
roundBitsMask = lastBitMask - 1;
|
||||
z = a;
|
||||
roundingMode = STATUS(float_rounding_mode);
|
||||
if ( roundingMode == float_round_nearest_even ) {
|
||||
switch (STATUS(float_rounding_mode)) {
|
||||
case float_round_nearest_even:
|
||||
z.low += lastBitMask>>1;
|
||||
if ( ( z.low & roundBitsMask ) == 0 ) z.low &= ~ lastBitMask;
|
||||
}
|
||||
else if ( roundingMode != float_round_to_zero ) {
|
||||
if ( extractFloatx80Sign( z ) ^ ( roundingMode == float_round_up ) ) {
|
||||
if ((z.low & roundBitsMask) == 0) {
|
||||
z.low &= ~lastBitMask;
|
||||
}
|
||||
break;
|
||||
case float_round_to_zero:
|
||||
break;
|
||||
case float_round_up:
|
||||
if (!extractFloatx80Sign(z)) {
|
||||
z.low += roundBitsMask;
|
||||
}
|
||||
break;
|
||||
case float_round_down:
|
||||
if (extractFloatx80Sign(z)) {
|
||||
z.low += roundBitsMask;
|
||||
}
|
||||
break;
|
||||
default:
|
||||
abort();
|
||||
}
|
||||
z.low &= ~ roundBitsMask;
|
||||
if ( z.low == 0 ) {
|
||||
|
|
@ -5774,7 +5833,6 @@ float128 float128_round_to_int( float128 a STATUS_PARAM )
|
|||
flag aSign;
|
||||
int32 aExp;
|
||||
uint64_t lastBitMask, roundBitsMask;
|
||||
int8 roundingMode;
|
||||
float128 z;
|
||||
|
||||
aExp = extractFloat128Exp( a );
|
||||
|
|
@ -5791,8 +5849,8 @@ float128 float128_round_to_int( float128 a STATUS_PARAM )
|
|||
lastBitMask = ( lastBitMask<<( 0x406E - aExp ) )<<1;
|
||||
roundBitsMask = lastBitMask - 1;
|
||||
z = a;
|
||||
roundingMode = STATUS(float_rounding_mode);
|
||||
if ( roundingMode == float_round_nearest_even ) {
|
||||
switch (STATUS(float_rounding_mode)) {
|
||||
case float_round_nearest_even:
|
||||
if ( lastBitMask ) {
|
||||
add128( z.high, z.low, 0, lastBitMask>>1, &z.high, &z.low );
|
||||
if ( ( z.low & roundBitsMask ) == 0 ) z.low &= ~ lastBitMask;
|
||||
|
|
@ -5803,12 +5861,21 @@ float128 float128_round_to_int( float128 a STATUS_PARAM )
|
|||
if ( (uint64_t) ( z.low<<1 ) == 0 ) z.high &= ~1;
|
||||
}
|
||||
}
|
||||
}
|
||||
else if ( roundingMode != float_round_to_zero ) {
|
||||
if ( extractFloat128Sign( z )
|
||||
^ ( roundingMode == float_round_up ) ) {
|
||||
add128( z.high, z.low, 0, roundBitsMask, &z.high, &z.low );
|
||||
break;
|
||||
case float_round_to_zero:
|
||||
break;
|
||||
case float_round_up:
|
||||
if (!extractFloat128Sign(z)) {
|
||||
add128(z.high, z.low, 0, roundBitsMask, &z.high, &z.low);
|
||||
}
|
||||
break;
|
||||
case float_round_down:
|
||||
if (extractFloat128Sign(z)) {
|
||||
add128(z.high, z.low, 0, roundBitsMask, &z.high, &z.low);
|
||||
}
|
||||
break;
|
||||
default:
|
||||
abort();
|
||||
}
|
||||
z.low &= ~ roundBitsMask;
|
||||
}
|
||||
|
|
@ -5842,19 +5909,29 @@ float128 float128_round_to_int( float128 a STATUS_PARAM )
|
|||
roundBitsMask = lastBitMask - 1;
|
||||
z.low = 0;
|
||||
z.high = a.high;
|
||||
roundingMode = STATUS(float_rounding_mode);
|
||||
if ( roundingMode == float_round_nearest_even ) {
|
||||
switch (STATUS(float_rounding_mode)) {
|
||||
case float_round_nearest_even:
|
||||
z.high += lastBitMask>>1;
|
||||
if ( ( ( z.high & roundBitsMask ) | a.low ) == 0 ) {
|
||||
z.high &= ~ lastBitMask;
|
||||
}
|
||||
}
|
||||
else if ( roundingMode != float_round_to_zero ) {
|
||||
if ( extractFloat128Sign( z )
|
||||
^ ( roundingMode == float_round_up ) ) {
|
||||
break;
|
||||
case float_round_to_zero:
|
||||
break;
|
||||
case float_round_up:
|
||||
if (!extractFloat128Sign(z)) {
|
||||
z.high |= ( a.low != 0 );
|
||||
z.high += roundBitsMask;
|
||||
}
|
||||
break;
|
||||
case float_round_down:
|
||||
if (extractFloat128Sign(z)) {
|
||||
z.high |= (a.low != 0);
|
||||
z.high += roundBitsMask;
|
||||
}
|
||||
break;
|
||||
default:
|
||||
abort();
|
||||
}
|
||||
z.high &= ~ roundBitsMask;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue