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arm64: Fix negs compare to minus int.MinValue #121380

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Merged
jakobbotsch merged 7 commits into from
Dec 4, 2025
Merged

arm64: Fix negs compare to minus int.MinValue #121380

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972b88a
arm64: Fix negs compare to minus int.MinValue
jonathandavies-arm Nov 5, 2025
0208da9
Remove SupportsSettingResultFlags()
jonathandavies-arm Nov 7, 2025
9587885
Merge branch 'main' into upstream/issue/121294
jonathandavies-arm Nov 10, 2025
40ea320
Merge branch 'main' into upstream/issue/121294
jonathandavies-arm Nov 14, 2025
7661629
Add SupportsSettingFlagsAsCompareToZero
jonathandavies-arm Nov 18, 2025
a664e3c
Move checks into SupportsSettingFlagsAsCompareToZero
jakobbotsch Nov 25, 2025
566c9de
Run jit-format
jakobbotsch Nov 25, 2025
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13 changes: 13 additions & 0 deletions src/coreclr/jit/gentree.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -19938,6 +19938,19 @@ bool GenTree::SupportsSettingZeroFlag()
return false;
}

//------------------------------------------------------------------------
// SupportsSettingFlagsAsCompareToZero: Returns true if we support setting
// flags for compare to zero operations.
//
bool GenTree::SupportsSettingFlagsAsCompareToZero()
{
#if defined(TARGET_ARM64)
return true;
#else
return false;
#endif
}

//------------------------------------------------------------------------
// Create: Create or retrieve a field sequence for the given field handle.
//
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2 changes: 2 additions & 0 deletions src/coreclr/jit/gentree.h
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Expand Up @@ -2070,6 +2070,8 @@ struct GenTree

bool SupportsSettingZeroFlag();

bool SupportsSettingFlagsAsCompareToZero();

// These are only used for dumping.
// The GetRegNum() is only valid in LIR, but the dumping methods are not easily
// modified to check this.
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2 changes: 1 addition & 1 deletion src/coreclr/jit/lower.cpp
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Expand Up @@ -4437,7 +4437,7 @@ GenTree* Lowering::OptimizeConstCompare(GenTree* cmp)
// Optimize EQ/NE/GT/GE/LT/LE(op_that_sets_zf, 0) into op_that_sets_zf with GTF_SET_FLAGS + SETCC.
LIR::Use use;
if (((cmp->OperIs(GT_EQ, GT_NE) && op2->IsIntegralConst(0) && op1->SupportsSettingZeroFlag()) ||
(cmp->OperIs(GT_GT, GT_GE, GT_LT, GT_LE) && op2->IsIntegralConst(0) && op1->OperIs(GT_AND, GT_AND_NOT))) &&
(cmp->OperIs(GT_GT, GT_GE, GT_LT, GT_LE) && op2->IsIntegralConst(0) && op1->OperIs(GT_AND, GT_AND_NOT) && op1->SupportsSettingFlagsAsCompareToZero())) &&
BlockRange().TryGetUse(cmp, &use) && IsProfitableToSetZeroFlag(op1))
{
op1->gtFlags |= GTF_SET_FLAGS;
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