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ppc: Fix emulated INFINITY and NAN conversions 

helper_todouble() was not properly converting INFINITY from 32 bit
float to 64 bit double.

(Normalized operand conversion is unchanged, other than indentation.)

Signed-off-by: Paul A. Clarke <pc@us.ibm.com>
Message-Id: <1566242388-9244-1-git-send-email-pc@us.ibm.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Paul A. Clarke 2019-08-19 14:19:48 -05:00 committed by David Gibson
parent e6f1bfb211
commit a7b7b98318
1 changed files with 11 additions and 4 deletions
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15
target/ppc/fpu_helper.c
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@ -58,10 +58,17 @@ uint64_t helper_todouble(uint32_t arg)
uint64_t ret;
if (likely(abs_arg >= 0x00800000)) {
/* Normalized operand, or Inf, or NaN. */
ret = (uint64_t)extract32(arg, 30, 2) << 62;
ret |= ((extract32(arg, 30, 1) ^ 1) * (uint64_t)7) << 59;
ret |= (uint64_t)extract32(arg, 0, 30) << 29;
if (unlikely(extract32(arg, 23, 8) == 0xff)) {
/* Inf or NAN. */
ret = (uint64_t)extract32(arg, 31, 1) << 63;
ret |= (uint64_t)0x7ff << 52;
ret |= (uint64_t)extract32(arg, 0, 23) << 29;
} else {
/* Normalized operand. */
ret = (uint64_t)extract32(arg, 30, 2) << 62;
ret |= ((extract32(arg, 30, 1) ^ 1) * (uint64_t)7) << 59;
ret |= (uint64_t)extract32(arg, 0, 30) << 29;
}
} else {
/* Zero or Denormalized operand. */
ret = (uint64_t)extract32(arg, 31, 1) << 63;