fpu/softfloat: Pass FloatClass to pickNaN
For each operand, pass a single enumeration instead of a pair of booleans. The commit also merges multiple different ifdef-selected implementations of pickNaN into a single function whose body is ifdef-selected. Tested-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
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@ -501,10 +501,10 @@ static float32 commonNaNToFloat32(commonNaNT a, float_status *status)
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| tie-break rule.
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| tie-break rule.
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*----------------------------------------------------------------------------*/
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*----------------------------------------------------------------------------*/
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#if defined(TARGET_ARM)
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static int pickNaN(FloatClass a_cls, FloatClass b_cls,
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static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN,
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flag aIsLargerSignificand)
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flag aIsLargerSignificand)
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{
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{
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#if defined(TARGET_ARM) || defined(TARGET_MIPS) || defined(TARGET_HPPA)
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/* ARM mandated NaN propagation rules (see FPProcessNaNs()), take
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/* ARM mandated NaN propagation rules (see FPProcessNaNs()), take
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* the first of:
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* the first of:
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* 1. A if it is signaling
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* 1. A if it is signaling
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@ -513,20 +513,6 @@ static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN,
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* 4. B (quiet)
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* 4. B (quiet)
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* A signaling NaN is always quietened before returning it.
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* A signaling NaN is always quietened before returning it.
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*/
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*/
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if (aIsSNaN) {
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return 0;
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} else if (bIsSNaN) {
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return 1;
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} else if (aIsQNaN) {
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return 0;
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} else {
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return 1;
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}
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}
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#elif defined(TARGET_MIPS) || defined(TARGET_HPPA)
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static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN,
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flag aIsLargerSignificand)
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{
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/* According to MIPS specifications, if one of the two operands is
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/* According to MIPS specifications, if one of the two operands is
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* a sNaN, a new qNaN has to be generated. This is done in
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* a sNaN, a new qNaN has to be generated. This is done in
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* floatXX_silence_nan(). For qNaN inputs the specifications
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* floatXX_silence_nan(). For qNaN inputs the specifications
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@ -540,35 +526,21 @@ static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN,
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* 4. B (quiet)
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* 4. B (quiet)
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* A signaling NaN is always silenced before returning it.
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* A signaling NaN is always silenced before returning it.
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*/
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*/
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if (aIsSNaN) {
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if (is_snan(a_cls)) {
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return 0;
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return 0;
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} else if (bIsSNaN) {
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} else if (is_snan(b_cls)) {
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return 1;
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return 1;
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} else if (aIsQNaN) {
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} else if (is_qnan(a_cls)) {
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return 0;
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return 0;
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} else {
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} else {
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return 1;
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return 1;
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}
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}
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}
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#elif defined(TARGET_PPC) || defined(TARGET_XTENSA) || defined(TARGET_M68K)
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#elif defined(TARGET_PPC) || defined(TARGET_XTENSA)
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static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN,
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flag aIsLargerSignificand)
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{
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/* PowerPC propagation rules:
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/* PowerPC propagation rules:
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* 1. A if it sNaN or qNaN
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* 1. A if it sNaN or qNaN
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* 2. B if it sNaN or qNaN
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* 2. B if it sNaN or qNaN
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* A signaling NaN is always silenced before returning it.
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* A signaling NaN is always silenced before returning it.
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*/
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*/
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if (aIsSNaN || aIsQNaN) {
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return 0;
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} else {
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return 1;
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}
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}
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#elif defined(TARGET_M68K)
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static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN,
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flag aIsLargerSignificand)
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{
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/* M68000 FAMILY PROGRAMMER'S REFERENCE MANUAL
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/* M68000 FAMILY PROGRAMMER'S REFERENCE MANUAL
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* 3.4 FLOATING-POINT INSTRUCTION DETAILS
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* 3.4 FLOATING-POINT INSTRUCTION DETAILS
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* If either operand, but not both operands, of an operation is a
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* If either operand, but not both operands, of an operation is a
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@ -583,16 +555,12 @@ static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN,
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* a nonsignaling NaN. The operation then continues as described in the
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* a nonsignaling NaN. The operation then continues as described in the
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* preceding paragraph for nonsignaling NaNs.
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* preceding paragraph for nonsignaling NaNs.
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*/
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*/
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if (aIsQNaN || aIsSNaN) { /* a is the destination operand */
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if (is_nan(a_cls)) {
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return 0; /* return the destination operand */
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return 0;
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} else {
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} else {
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return 1; /* return b */
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return 1;
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}
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}
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}
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#else
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#else
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static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN,
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flag aIsLargerSignificand)
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{
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/* This implements x87 NaN propagation rules:
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/* This implements x87 NaN propagation rules:
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* SNaN + QNaN => return the QNaN
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* SNaN + QNaN => return the QNaN
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* two SNaNs => return the one with the larger significand, silenced
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* two SNaNs => return the one with the larger significand, silenced
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@ -603,13 +571,13 @@ static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN,
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* If we get down to comparing significands and they are the same,
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* If we get down to comparing significands and they are the same,
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* return the NaN with the positive sign bit (if any).
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* return the NaN with the positive sign bit (if any).
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*/
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*/
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if (aIsSNaN) {
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if (is_snan(a_cls)) {
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if (bIsSNaN) {
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if (is_snan(b_cls)) {
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return aIsLargerSignificand ? 0 : 1;
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return aIsLargerSignificand ? 0 : 1;
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}
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}
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return bIsQNaN ? 1 : 0;
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return is_qnan(b_cls) ? 1 : 0;
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} else if (aIsQNaN) {
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} else if (is_qnan(a_cls)) {
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if (bIsSNaN || !bIsQNaN) {
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if (is_snan(b_cls) || !is_qnan(b_cls)) {
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return 0;
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return 0;
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} else {
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} else {
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return aIsLargerSignificand ? 0 : 1;
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return aIsLargerSignificand ? 0 : 1;
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@ -617,8 +585,8 @@ static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN,
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} else {
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} else {
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return 1;
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return 1;
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}
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}
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}
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#endif
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#endif
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}
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/*----------------------------------------------------------------------------
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/*----------------------------------------------------------------------------
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| Select which NaN to propagate for a three-input operation.
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| Select which NaN to propagate for a three-input operation.
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@ -752,18 +720,26 @@ static int pickNaNMulAdd(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN,
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static float32 propagateFloat32NaN(float32 a, float32 b, float_status *status)
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static float32 propagateFloat32NaN(float32 a, float32 b, float_status *status)
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{
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{
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flag aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN;
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flag aIsLargerSignificand;
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flag aIsLargerSignificand;
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uint32_t av, bv;
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uint32_t av, bv;
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FloatClass a_cls, b_cls;
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/* This is not complete, but is good enough for pickNaN. */
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a_cls = (!float32_is_any_nan(a)
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? float_class_normal
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: float32_is_signaling_nan(a, status)
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? float_class_snan
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: float_class_qnan);
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b_cls = (!float32_is_any_nan(b)
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? float_class_normal
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: float32_is_signaling_nan(b, status)
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? float_class_snan
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: float_class_qnan);
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aIsQuietNaN = float32_is_quiet_nan(a, status);
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aIsSignalingNaN = float32_is_signaling_nan(a, status);
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bIsQuietNaN = float32_is_quiet_nan(b, status);
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bIsSignalingNaN = float32_is_signaling_nan(b, status);
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av = float32_val(a);
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av = float32_val(a);
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bv = float32_val(b);
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bv = float32_val(b);
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if (aIsSignalingNaN | bIsSignalingNaN) {
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if (is_snan(a_cls) || is_snan(b_cls)) {
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float_raise(float_flag_invalid, status);
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float_raise(float_flag_invalid, status);
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}
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}
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@ -779,14 +755,13 @@ static float32 propagateFloat32NaN(float32 a, float32 b, float_status *status)
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aIsLargerSignificand = (av < bv) ? 1 : 0;
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aIsLargerSignificand = (av < bv) ? 1 : 0;
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}
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}
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if (pickNaN(aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN,
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if (pickNaN(a_cls, b_cls, aIsLargerSignificand)) {
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aIsLargerSignificand)) {
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if (is_snan(b_cls)) {
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if (bIsSignalingNaN) {
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return float32_silence_nan(b, status);
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return float32_silence_nan(b, status);
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}
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}
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return b;
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return b;
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} else {
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} else {
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if (aIsSignalingNaN) {
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if (is_snan(a_cls)) {
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return float32_silence_nan(a, status);
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return float32_silence_nan(a, status);
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}
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}
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return a;
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return a;
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@ -908,18 +883,26 @@ static float64 commonNaNToFloat64(commonNaNT a, float_status *status)
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static float64 propagateFloat64NaN(float64 a, float64 b, float_status *status)
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static float64 propagateFloat64NaN(float64 a, float64 b, float_status *status)
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{
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{
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flag aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN;
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flag aIsLargerSignificand;
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flag aIsLargerSignificand;
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uint64_t av, bv;
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uint64_t av, bv;
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FloatClass a_cls, b_cls;
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/* This is not complete, but is good enough for pickNaN. */
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a_cls = (!float64_is_any_nan(a)
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? float_class_normal
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: float64_is_signaling_nan(a, status)
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? float_class_snan
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: float_class_qnan);
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b_cls = (!float64_is_any_nan(b)
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? float_class_normal
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: float64_is_signaling_nan(b, status)
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? float_class_snan
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: float_class_qnan);
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aIsQuietNaN = float64_is_quiet_nan(a, status);
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aIsSignalingNaN = float64_is_signaling_nan(a, status);
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bIsQuietNaN = float64_is_quiet_nan(b, status);
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bIsSignalingNaN = float64_is_signaling_nan(b, status);
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av = float64_val(a);
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av = float64_val(a);
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bv = float64_val(b);
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bv = float64_val(b);
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if (aIsSignalingNaN | bIsSignalingNaN) {
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if (is_snan(a_cls) || is_snan(b_cls)) {
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float_raise(float_flag_invalid, status);
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float_raise(float_flag_invalid, status);
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}
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}
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@ -935,14 +918,13 @@ static float64 propagateFloat64NaN(float64 a, float64 b, float_status *status)
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aIsLargerSignificand = (av < bv) ? 1 : 0;
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aIsLargerSignificand = (av < bv) ? 1 : 0;
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}
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}
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if (pickNaN(aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN,
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if (pickNaN(a_cls, b_cls, aIsLargerSignificand)) {
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aIsLargerSignificand)) {
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if (is_snan(b_cls)) {
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if (bIsSignalingNaN) {
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return float64_silence_nan(b, status);
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return float64_silence_nan(b, status);
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}
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}
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return b;
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return b;
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} else {
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} else {
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if (aIsSignalingNaN) {
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if (is_snan(a_cls)) {
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return float64_silence_nan(a, status);
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return float64_silence_nan(a, status);
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}
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}
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return a;
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return a;
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@ -1075,15 +1057,22 @@ static floatx80 commonNaNToFloatx80(commonNaNT a, float_status *status)
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floatx80 propagateFloatx80NaN(floatx80 a, floatx80 b, float_status *status)
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floatx80 propagateFloatx80NaN(floatx80 a, floatx80 b, float_status *status)
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{
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{
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flag aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN;
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flag aIsLargerSignificand;
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flag aIsLargerSignificand;
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FloatClass a_cls, b_cls;
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aIsQuietNaN = floatx80_is_quiet_nan(a, status);
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/* This is not complete, but is good enough for pickNaN. */
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aIsSignalingNaN = floatx80_is_signaling_nan(a, status);
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a_cls = (!floatx80_is_any_nan(a)
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bIsQuietNaN = floatx80_is_quiet_nan(b, status);
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? float_class_normal
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bIsSignalingNaN = floatx80_is_signaling_nan(b, status);
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: floatx80_is_signaling_nan(a, status)
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? float_class_snan
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: float_class_qnan);
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b_cls = (!floatx80_is_any_nan(b)
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? float_class_normal
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: floatx80_is_signaling_nan(b, status)
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? float_class_snan
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: float_class_qnan);
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if (aIsSignalingNaN | bIsSignalingNaN) {
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if (is_snan(a_cls) || is_snan(b_cls)) {
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float_raise(float_flag_invalid, status);
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float_raise(float_flag_invalid, status);
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}
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}
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@ -1099,14 +1088,13 @@ floatx80 propagateFloatx80NaN(floatx80 a, floatx80 b, float_status *status)
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aIsLargerSignificand = (a.high < b.high) ? 1 : 0;
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aIsLargerSignificand = (a.high < b.high) ? 1 : 0;
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}
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}
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if (pickNaN(aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN,
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if (pickNaN(a_cls, b_cls, aIsLargerSignificand)) {
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aIsLargerSignificand)) {
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if (is_snan(b_cls)) {
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if (bIsSignalingNaN) {
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return floatx80_silence_nan(b, status);
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return floatx80_silence_nan(b, status);
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}
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}
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return b;
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return b;
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} else {
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} else {
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if (aIsSignalingNaN) {
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if (is_snan(a_cls)) {
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return floatx80_silence_nan(a, status);
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return floatx80_silence_nan(a, status);
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}
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}
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return a;
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return a;
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@ -1217,15 +1205,22 @@ static float128 commonNaNToFloat128(commonNaNT a, float_status *status)
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static float128 propagateFloat128NaN(float128 a, float128 b,
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static float128 propagateFloat128NaN(float128 a, float128 b,
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float_status *status)
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float_status *status)
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{
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{
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flag aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN;
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flag aIsLargerSignificand;
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flag aIsLargerSignificand;
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FloatClass a_cls, b_cls;
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aIsQuietNaN = float128_is_quiet_nan(a, status);
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/* This is not complete, but is good enough for pickNaN. */
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aIsSignalingNaN = float128_is_signaling_nan(a, status);
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a_cls = (!float128_is_any_nan(a)
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bIsQuietNaN = float128_is_quiet_nan(b, status);
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? float_class_normal
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bIsSignalingNaN = float128_is_signaling_nan(b, status);
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: float128_is_signaling_nan(a, status)
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? float_class_snan
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: float_class_qnan);
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b_cls = (!float128_is_any_nan(b)
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? float_class_normal
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: float128_is_signaling_nan(b, status)
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? float_class_snan
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: float_class_qnan);
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if (aIsSignalingNaN | bIsSignalingNaN) {
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if (is_snan(a_cls) || is_snan(b_cls)) {
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float_raise(float_flag_invalid, status);
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float_raise(float_flag_invalid, status);
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}
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}
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@ -1241,14 +1236,13 @@ static float128 propagateFloat128NaN(float128 a, float128 b,
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aIsLargerSignificand = (a.high < b.high) ? 1 : 0;
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aIsLargerSignificand = (a.high < b.high) ? 1 : 0;
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}
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}
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if (pickNaN(aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN,
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if (pickNaN(a_cls, b_cls, aIsLargerSignificand)) {
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aIsLargerSignificand)) {
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if (is_snan(b_cls)) {
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if (bIsSignalingNaN) {
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|
||||||
return float128_silence_nan(b, status);
|
return float128_silence_nan(b, status);
|
||||||
}
|
}
|
||||||
return b;
|
return b;
|
||||||
} else {
|
} else {
|
||||||
if (aIsSignalingNaN) {
|
if (is_snan(a_cls)) {
|
||||||
return float128_silence_nan(a, status);
|
return float128_silence_nan(a, status);
|
||||||
}
|
}
|
||||||
return a;
|
return a;
|
||||||
|
@ -580,8 +580,7 @@ static FloatParts pick_nan(FloatParts a, FloatParts b, float_status *s)
|
|||||||
if (s->default_nan_mode) {
|
if (s->default_nan_mode) {
|
||||||
return parts_default_nan(s);
|
return parts_default_nan(s);
|
||||||
} else {
|
} else {
|
||||||
if (pickNaN(is_qnan(a.cls), is_snan(a.cls),
|
if (pickNaN(a.cls, b.cls,
|
||||||
is_qnan(b.cls), is_snan(b.cls),
|
|
||||||
a.frac > b.frac ||
|
a.frac > b.frac ||
|
||||||
(a.frac == b.frac && a.sign < b.sign))) {
|
(a.frac == b.frac && a.sign < b.sign))) {
|
||||||
a = b;
|
a = b;
|
||||||
|
Loading…
Reference in New Issue
Block a user