[SPIRV] Added support for the constrained comparison intrinsics #157439
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@llvm/pr-subscribers-backend-spir-v Author: Subash B (SubashBoopathi) ChangesAdded SPIR-V support for constrained floating-point comparison intrinsics (fcmp, fcmps) with lowering and tests. Full diff: https://github.com/llvm/llvm-project/pull/157439.diff 2 Files Affected:
diff --git a/llvm/lib/Target/SPIRV/SPIRVPrepareFunctions.cpp b/llvm/lib/Target/SPIRV/SPIRVPrepareFunctions.cpp
index 2bffbf73b574a..c10bfc66fdcb8 100644
--- a/llvm/lib/Target/SPIRV/SPIRVPrepareFunctions.cpp
+++ b/llvm/lib/Target/SPIRV/SPIRVPrepareFunctions.cpp
@@ -335,6 +335,21 @@ static void lowerFunnelShifts(IntrinsicInst *FSHIntrinsic) {
FSHIntrinsic->setCalledFunction(FSHFunc);
}
+static void lowerConstrainedFPCmpIntrinsic(
+ ConstrainedFPCmpIntrinsic *ConstrainedCmpIntrinsic,
+ SmallVector<Instruction *> &EraseFromParent) {
+ if (!ConstrainedCmpIntrinsic)
+ return;
+ // Extract the floating-point values being compared
+ Value *LHS = ConstrainedCmpIntrinsic->getArgOperand(0);
+ Value *RHS = ConstrainedCmpIntrinsic->getArgOperand(1);
+ FCmpInst::Predicate Pred = ConstrainedCmpIntrinsic->getPredicate();
+ IRBuilder<> Builder(ConstrainedCmpIntrinsic);
+ Value *FCmp = Builder.CreateFCmp(Pred, LHS, RHS);
+ ConstrainedCmpIntrinsic->replaceAllUsesWith(FCmp);
+ EraseFromParent.push_back(dyn_cast<Instruction>(ConstrainedCmpIntrinsic));
+}
+
static void lowerExpectAssume(IntrinsicInst *II) {
// If we cannot use the SPV_KHR_expect_assume extension, then we need to
// ignore the intrinsic and move on. It should be removed later on by LLVM.
@@ -379,6 +394,7 @@ static bool toSpvOverloadedIntrinsic(IntrinsicInst *II, Intrinsic::ID NewID,
bool SPIRVPrepareFunctions::substituteIntrinsicCalls(Function *F) {
bool Changed = false;
const SPIRVSubtarget &STI = TM.getSubtarget<SPIRVSubtarget>(*F);
+ SmallVector<Instruction *> EraseFromParent;
for (BasicBlock &BB : *F) {
for (Instruction &I : BB) {
auto Call = dyn_cast<CallInst>(&I);
@@ -420,9 +436,17 @@ bool SPIRVPrepareFunctions::substituteIntrinsicCalls(Function *F) {
lowerPtrAnnotation(II);
Changed = true;
break;
+ case Intrinsic::experimental_constrained_fcmp:
+ case Intrinsic::experimental_constrained_fcmps:
+ lowerConstrainedFPCmpIntrinsic(dyn_cast<ConstrainedFPCmpIntrinsic>(II),
+ EraseFromParent);
+ Changed = true;
+ break;
}
}
}
+ for (auto *I : EraseFromParent)
+ I->eraseFromParent();
return Changed;
}
diff --git a/llvm/test/CodeGen/SPIRV/llvm-intrinsics/constrained-comparison.ll b/llvm/test/CodeGen/SPIRV/llvm-intrinsics/constrained-comparison.ll
new file mode 100644
index 0000000000000..49bb8eac10be8
--- /dev/null
+++ b/llvm/test/CodeGen/SPIRV/llvm-intrinsics/constrained-comparison.ll
@@ -0,0 +1,56 @@
+; RUN: llc -verify-machineinstrs -O0 -mtriple=spirv64-unknown-unknown %s -o - | FileCheck %s
+; RUN: %if spirv-tools %{ llc -O0 -mtriple=spirv64-unknown-unknown %s -o - -filetype=obj | spirv-val %}
+
+; CHECK-DAG: OpFOrdEqual
+; CHECK-DAG: OpFOrdGreaterThan
+; CHECK-DAG: OpFOrdGreaterThanEqual
+; CHECK-DAG: OpFOrdLessThan
+; CHECK-DAG: OpFOrdLessThanEqual
+; CHECK-DAG: OpFOrdNotEqual
+; CHECK-DAG: OpOrdered
+; CHECK-DAG: OpFUnordEqual
+; CHECK-DAG: OpFUnordGreaterThan
+; CHECK-DAG: OpFUnordGreaterThanEqual
+; CHECK-DAG: OpFUnordLessThan
+; CHECK-DAG: OpFUnordLessThanEqual
+; CHECK-DAG: OpFUnordNotEqual
+; CHECK-DAG: OpUnordered
+
+define dso_local spir_kernel void @test(float %a){
+entry:
+ %cmp = tail call i1 @llvm.experimental.constrained.fcmps.f32(float %a, float %a, metadata !"oeq", metadata !"fpexcept.strict")
+ %cmp1 = tail call i1 @llvm.experimental.constrained.fcmps.f32(float %a, float %a, metadata !"ogt", metadata !"fpexcept.strict")
+ %cmp2 = tail call i1 @llvm.experimental.constrained.fcmps.f32(float %a, float %a, metadata !"oge", metadata !"fpexcept.strict")
+ %cmp3 = tail call i1 @llvm.experimental.constrained.fcmp.f32(float %a, float %a, metadata !"olt", metadata !"fpexcept.strict")
+ %cmp4 = tail call i1 @llvm.experimental.constrained.fcmp.f32(float %a, float %a, metadata !"ole", metadata !"fpexcept.strict")
+ %cmp5 = tail call i1 @llvm.experimental.constrained.fcmp.f32(float %a, float %a, metadata !"one", metadata !"fpexcept.strict")
+ %cmp6 = tail call i1 @llvm.experimental.constrained.fcmp.f32(float %a, float %a, metadata !"ord", metadata !"fpexcept.strict")
+ %cmp7 = tail call i1 @llvm.experimental.constrained.fcmp.f32(float %a, float %a, metadata !"ueq", metadata !"fpexcept.strict")
+ %cmp8 = tail call i1 @llvm.experimental.constrained.fcmp.f32(float %a, float %a, metadata !"ugt", metadata !"fpexcept.strict")
+ %cmp9 = tail call i1 @llvm.experimental.constrained.fcmp.f32(float %a, float %a, metadata !"uge", metadata !"fpexcept.strict")
+ %cmp10 = tail call i1 @llvm.experimental.constrained.fcmp.f32(float %a, float %a, metadata !"ult", metadata !"fpexcept.strict")
+ %cmp11 = tail call i1 @llvm.experimental.constrained.fcmp.f32(float %a, float %a, metadata !"ule", metadata !"fpexcept.strict")
+ %cmp12 = tail call i1 @llvm.experimental.constrained.fcmp.f32(float %a, float %a, metadata !"une", metadata !"fpexcept.strict")
+ %cmp13 = tail call i1 @llvm.experimental.constrained.fcmp.f32(float %a, float %a, metadata !"uno", metadata !"fpexcept.strict")
+
+ %or1 = or i1 %cmp, %cmp1
+ %or2 = or i1 %or1, %cmp2
+ %or3 = or i1 %or2, %cmp3
+ %or4 = or i1 %or3, %cmp4
+ %or5 = or i1 %or4, %cmp5
+ %or6 = or i1 %or5, %cmp6
+ %or7 = or i1 %or6, %cmp7
+ %or8 = or i1 %or7, %cmp8
+ %or9 = or i1 %or8, %cmp9
+ %or10 = or i1 %or9, %cmp10
+ %or11 = or i1 %or10, %cmp11
+ %or12 = or i1 %or11, %cmp12
+ %or13 = or i1 %or12, %cmp13
+ br i1 %or13, label %true_block, label %false_block
+true_block:
+ ret void
+false_block:
+ ret void
+}
+declare i1 @llvm.experimental.constrained.fcmps.f32(float, float, metadata, metadata)
+declare i1 @llvm.experimental.constrained.fcmp.f32(float, float, metadata, metadata)
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michalpaszkowski
approved these changes
Sep 11, 2025
|
@SubashBoopathi Congratulations on having your first Pull Request (PR) merged into the LLVM Project! Your changes will be combined with recent changes from other authors, then tested by our build bots. If there is a problem with a build, you may receive a report in an email or a comment on this PR. Please check whether problems have been caused by your change specifically, as the builds can include changes from many authors. It is not uncommon for your change to be included in a build that fails due to someone else's changes, or infrastructure issues. How to do this, and the rest of the post-merge process, is covered in detail here. If your change does cause a problem, it may be reverted, or you can revert it yourself. This is a normal part of LLVM development. You can fix your changes and open a new PR to merge them again. If you don't get any reports, no action is required from you. Your changes are working as expected, well done! |
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LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/190/builds/28311 Here is the relevant piece of the build log for the reference |
mahesh-attarde
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Oct 3, 2025
…#157439) Added SPIR-V support for constrained floating-point comparison intrinsics (fcmp, fcmps) with lowering and tests.
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Added SPIR-V support for constrained floating-point comparison intrinsics (fcmp, fcmps) with lowering and tests.