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[GlobalIsel] Combine select to integer min max more #92570
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@llvm/pr-subscribers-llvm-globalisel @llvm/pr-subscribers-backend-aarch64 Author: Thorsten Schütt (tschuett) ChangesFull diff: https://github.com/llvm/llvm-project/pull/92570.diff 3 Files Affected:
diff --git a/llvm/include/llvm/Target/GlobalISel/Combine.td b/llvm/include/llvm/Target/GlobalISel/Combine.td
index a1d39d910bc8e..5d4b5a2479f6a 100644
--- a/llvm/include/llvm/Target/GlobalISel/Combine.td
+++ b/llvm/include/llvm/Target/GlobalISel/Combine.td
@@ -1309,7 +1309,7 @@ def select_to_minmax: GICombineRule<
def select_to_iminmax: GICombineRule<
(defs root:$root, build_fn_matchinfo:$info),
- (match (G_ICMP $tst, $tst1, $x, $y),
+ (match (G_ICMP $tst, $tst1, $a, $b),
(G_SELECT $root, $tst, $x, $y),
[{ return Helper.matchSelectIMinMax(${root}, ${info}); }]),
(apply [{ Helper.applyBuildFnMO(${root}, ${info}); }])>;
diff --git a/llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp b/llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
index a87a26d72b452..0d2e59541b05a 100644
--- a/llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
@@ -6772,46 +6772,62 @@ bool CombinerHelper::matchSelectIMinMax(const MachineOperand &MO,
if (CmpInst::isEquality(Pred))
return false;
- [[maybe_unused]] Register CmpLHS = Cmp->getLHSReg();
- [[maybe_unused]] Register CmpRHS = Cmp->getRHSReg();
+ Register CmpLHS = Cmp->getLHSReg();
+ Register CmpRHS = Cmp->getRHSReg();
+
+ // We can swap CmpLHS and CmpRHS for higher hitrate.
+ if (True == CmpRHS && False == CmpLHS) {
+ std::swap(CmpLHS, CmpRHS);
+ Pred = CmpInst::getSwappedPredicate(Pred);
+ }
// (icmp X, Y) ? X : Y -> integer minmax.
// see matchSelectPattern in ValueTracking.
// Legality between G_SELECT and integer minmax can differ.
- assert(True == CmpLHS && False == CmpRHS && "unexpected MIR pattern");
-
- switch (Pred) {
- case ICmpInst::ICMP_UGT:
- case ICmpInst::ICMP_UGE: {
- if (!isLegalOrBeforeLegalizer({TargetOpcode::G_UMAX, DstTy}))
- return false;
- MatchInfo = [=](MachineIRBuilder &B) { B.buildUMax(DstReg, True, False); };
- return true;
- }
- case ICmpInst::ICMP_SGT:
- case ICmpInst::ICMP_SGE: {
- if (!isLegalOrBeforeLegalizer({TargetOpcode::G_SMAX, DstTy}))
- return false;
- MatchInfo = [=](MachineIRBuilder &B) { B.buildSMax(DstReg, True, False); };
- return true;
- }
- case ICmpInst::ICMP_ULT:
- case ICmpInst::ICMP_ULE: {
- if (!isLegalOrBeforeLegalizer({TargetOpcode::G_UMIN, DstTy}))
- return false;
- MatchInfo = [=](MachineIRBuilder &B) { B.buildUMin(DstReg, True, False); };
- return true;
- }
- case ICmpInst::ICMP_SLT:
- case ICmpInst::ICMP_SLE: {
- if (!isLegalOrBeforeLegalizer({TargetOpcode::G_SMIN, DstTy}))
+ if (True == CmpLHS && False == CmpRHS) {
+ switch (Pred) {
+ case ICmpInst::ICMP_UGT:
+ case ICmpInst::ICMP_UGE: {
+ if (!isLegalOrBeforeLegalizer({TargetOpcode::G_UMAX, DstTy}))
+ return false;
+ MatchInfo = [=](MachineIRBuilder &B) {
+ B.buildUMax(DstReg, True, False);
+ };
+ return true;
+ }
+ case ICmpInst::ICMP_SGT:
+ case ICmpInst::ICMP_SGE: {
+ if (!isLegalOrBeforeLegalizer({TargetOpcode::G_SMAX, DstTy}))
+ return false;
+ MatchInfo = [=](MachineIRBuilder &B) {
+ B.buildSMax(DstReg, True, False);
+ };
+ return true;
+ }
+ case ICmpInst::ICMP_ULT:
+ case ICmpInst::ICMP_ULE: {
+ if (!isLegalOrBeforeLegalizer({TargetOpcode::G_UMIN, DstTy}))
+ return false;
+ MatchInfo = [=](MachineIRBuilder &B) {
+ B.buildUMin(DstReg, True, False);
+ };
+ return true;
+ }
+ case ICmpInst::ICMP_SLT:
+ case ICmpInst::ICMP_SLE: {
+ if (!isLegalOrBeforeLegalizer({TargetOpcode::G_SMIN, DstTy}))
+ return false;
+ MatchInfo = [=](MachineIRBuilder &B) {
+ B.buildSMin(DstReg, True, False);
+ };
+ return true;
+ }
+ default:
return false;
- MatchInfo = [=](MachineIRBuilder &B) { B.buildSMin(DstReg, True, False); };
- return true;
- }
- default:
- return false;
+ }
}
+
+ return false;
}
bool CombinerHelper::matchSelect(MachineInstr &MI, BuildFnTy &MatchInfo) {
diff --git a/llvm/test/CodeGen/AArch64/GlobalISel/combine-select.mir b/llvm/test/CodeGen/AArch64/GlobalISel/combine-select.mir
index 8d9ad8d7cacaf..353c1550d6974 100644
--- a/llvm/test/CodeGen/AArch64/GlobalISel/combine-select.mir
+++ b/llvm/test/CodeGen/AArch64/GlobalISel/combine-select.mir
@@ -911,8 +911,7 @@ body: |
; CHECK-NEXT: %f1:_(s32) = G_TRUNC [[COPY1]](s64)
; CHECK-NEXT: %t:_(<4 x s32>) = G_BUILD_VECTOR %t1(s32), %t1(s32), %t1(s32), %t1(s32)
; CHECK-NEXT: %f:_(<4 x s32>) = G_BUILD_VECTOR %f1(s32), %f1(s32), %f1(s32), %f1(s32)
- ; CHECK-NEXT: %c:_(<4 x s32>) = G_ICMP intpred(sle), %f(<4 x s32>), %t
- ; CHECK-NEXT: %sel:_(<4 x s32>) = exact G_SELECT %c(<4 x s32>), %t, %f
+ ; CHECK-NEXT: %sel:_(<4 x s32>) = G_SMAX %t, %f
; CHECK-NEXT: $q0 = COPY %sel(<4 x s32>)
%0:_(s64) = COPY $x0
%1:_(s64) = COPY $x1
|
jayfoad
approved these changes
May 17, 2024
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LGTM, thanks.
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