mirrors-yuzu-emu/unicorn
1
0
Fork 0
mirror of https://github.com/yuzu-emu/unicorn synced 2024-11-24 13:28:18 +00:00
Code Issues Projects Releases Packages Wiki Activity

target-hppa: Add softfloat specializations

Browse source 
Like the original MIPS, HPPA has the MSB of an SNaN set.
However, it has different rules for silencing an SNaN:
(1) msb is cleared and (2) msb-1 must be set if the fraction
is now zero, and (implementation defined) may be set always.
I haven't checked real hardware but chose the set always
alternative because it's easy and within spec.

Backports commit 005fa38d86257d471ac461c066a5409a9f5ebb02 from qemu
This commit is contained in:
Richard Henderson 2018-03-01 23:42:01 -05:00 committed by Lioncash
parent 11c66029b7
commit 5c4f79ac62
No known key found for this signature in database
GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 19 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

20
qemu/fpu/softfloat-specialize.h
View file

@ -116,6 +116,8 @@ float32 float32_default_nan(float_status *status)
#elif defined(TARGET_PPC) || defined(TARGET_ARM) || defined(TARGET_ALPHA) || \
defined(TARGET_XTENSA)
return const_float32(0x7FC00000);
#elif defined(TARGET_HPPA)
return const_float32(0x7FA00000);
#else
if (status->snan_bit_is_one) {
return const_float32(0x7FBFFFFF);
@ -138,6 +140,8 @@ float64 float64_default_nan(float_status *status)
return const_float64(LIT64(0x7FFFFFFFFFFFFFFF));
#elif defined(TARGET_PPC) || defined(TARGET_ARM) || defined(TARGET_ALPHA)
return const_float64(LIT64(0x7FF8000000000000));
#elif defined(TARGET_HPPA)
return const_float64(LIT64(0x7FF4000000000000));
#else
if (status->snan_bit_is_one) {
return const_float64(LIT64(0x7FF7FFFFFFFFFFFF));
@ -361,7 +365,14 @@ float32 float32_maybe_silence_nan(float32 a_, float_status *status)
{
if (float32_is_signaling_nan(a_, status)) {
if (status->snan_bit_is_one) {
#ifdef TARGET_HPPA
uint32_t a = float32_val(a_);
a &= ~0x00400000;
a |= 0x00200000;
return make_float32(a);
#else
return float32_default_nan(status);
#endif
} else {
uint32_t a = float32_val(a_);
a |= (1 << 22);
@ -449,7 +460,7 @@ static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN,
return 1;
}
}
#elif defined(TARGET_MIPS)
#elif defined(TARGET_MIPS) || defined(TARGET_HPPA)
static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN,
flag aIsLargerSignificand)
{
@ -789,7 +800,14 @@ float64 float64_maybe_silence_nan(float64 a_, float_status *status)
{
if (float64_is_signaling_nan(a_, status)) {
if (status->snan_bit_is_one) {
#ifdef TARGET_HPPA
uint64_t a = float64_val(a_);
a &= ~0x0008000000000000ULL;
a |= 0x0004000000000000ULL;
return make_float64(a);
#else
return float64_default_nan(status);
#endif
} else {
uint64_t a = float64_val(a_);
a |= LIT64(0x0008000000000000);