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Jits: Don't use fast double-to-single when input is double precision

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The fast path of using CVTSD2SS/FCVTN rounds the significand if it
can't be exactly represented as a single, whereas the accurate path
instead truncates the significand. So we should only use the fast
path if we know that the lower bits of the significand are not set.

This is not known to affect any games.
This commit is contained in:
JosJuice 2021-06-16 18:26:02 +02:00
parent 88fd9fd577
commit 6fe96d12c6
2 changed files with 3 additions and 3 deletions
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2
Source/Core/Core/PowerPC/Jit64/Jit_LoadStoreFloating.cpp
View file

@ -104,7 +104,7 @@ void Jit64::stfXXX(UGeckoInstruction inst)
if (single)
{
if (js.fpr_is_store_safe[s])
if (js.fpr_is_store_safe[s] && js.op->fprIsSingle[s])
{
RCOpArg Rs = fpr.Use(s, RCMode::Read);
RegCache::Realize(Rs);

4
Source/Core/Core/PowerPC/JitArm64/JitArm64_FloatingPoint.cpp
View file

@ -603,7 +603,7 @@ void JitArm64::frsqrtex(UGeckoInstruction inst)
void JitArm64::ConvertDoubleToSingleLower(size_t guest_reg, ARM64Reg dest_reg, ARM64Reg src_reg)
{
if (js.fpr_is_store_safe[guest_reg])
if (js.fpr_is_store_safe[guest_reg] && js.op->fprIsSingle[guest_reg])
{
m_float_emit.FCVT(32, 64, EncodeRegToDouble(dest_reg), EncodeRegToDouble(src_reg));
return;
@ -623,7 +623,7 @@ void JitArm64::ConvertDoubleToSingleLower(size_t guest_reg, ARM64Reg dest_reg, A
void JitArm64::ConvertDoubleToSinglePair(size_t guest_reg, ARM64Reg dest_reg, ARM64Reg src_reg)
{
if (js.fpr_is_store_safe[guest_reg])
if (js.fpr_is_store_safe[guest_reg] && js.op->fprIsSingle[guest_reg])
{
m_float_emit.FCVTN(32, EncodeRegToDouble(dest_reg), EncodeRegToDouble(src_reg));
return;