DAG: Add AssertNoFPClass from call return attributes #167264
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@llvm/pr-subscribers-backend-amdgpu @llvm/pr-subscribers-llvm-selectiondag Author: Matt Arsenault (arsenm) ChangesThis defends against regressions in future patches. This excludes Full diff: https://github.com/llvm/llvm-project/pull/167264.diff 3 Files Affected:
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index 88b0809b767b5..6a9022dff41ad 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -4638,6 +4638,12 @@ static std::optional<ConstantRange> getRange(const Instruction &I) {
return std::nullopt;
}
+static FPClassTest getNoFPClass(const Instruction &I) {
+ if (const auto *CB = dyn_cast<CallBase>(&I))
+ return CB->getRetNoFPClass();
+ return fcNone;
+}
+
void SelectionDAGBuilder::visitLoad(const LoadInst &I) {
if (I.isAtomic())
return visitAtomicLoad(I);
@@ -9132,6 +9138,7 @@ void SelectionDAGBuilder::LowerCallTo(const CallBase &CB, SDValue Callee,
if (Result.first.getNode()) {
Result.first = lowerRangeToAssertZExt(DAG, CB, Result.first);
+ Result.first = lowerNoFPClassToAssertNoFPClass(DAG, CB, Result.first);
setValue(&CB, Result.first);
}
@@ -10718,6 +10725,16 @@ SDValue SelectionDAGBuilder::lowerRangeToAssertZExt(SelectionDAG &DAG,
return DAG.getMergeValues(Ops, SL);
}
+SDValue SelectionDAGBuilder::lowerNoFPClassToAssertNoFPClass(
+ SelectionDAG &DAG, const Instruction &I, SDValue Op) {
+ FPClassTest Classes = getNoFPClass(I);
+ if (Classes == fcNone)
+ return Op;
+
+ return DAG.getNode(ISD::AssertNoFPClass, SDLoc(Op), Op.getValueType(), Op,
+ DAG.getTargetConstant(Classes, SDLoc(), MVT::i32));
+}
+
/// Populate a CallLowerinInfo (into \p CLI) based on the properties of
/// the call being lowered.
///
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
index ed63bee58c957..13e2daa783147 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
@@ -429,6 +429,10 @@ class SelectionDAGBuilder {
SDValue lowerRangeToAssertZExt(SelectionDAG &DAG, const Instruction &I,
SDValue Op);
+ // Lower nofpclass attributes to AssertNoFPClass
+ SDValue lowerNoFPClassToAssertNoFPClass(SelectionDAG &DAG,
+ const Instruction &I, SDValue Op);
+
void populateCallLoweringInfo(TargetLowering::CallLoweringInfo &CLI,
const CallBase *Call, unsigned ArgIdx,
unsigned NumArgs, SDValue Callee,
diff --git a/llvm/test/CodeGen/AMDGPU/nofpclass-call.ll b/llvm/test/CodeGen/AMDGPU/nofpclass-call.ll
index 1861f02ec8b1c..5f303cc2a1eef 100644
--- a/llvm/test/CodeGen/AMDGPU/nofpclass-call.ll
+++ b/llvm/test/CodeGen/AMDGPU/nofpclass-call.ll
@@ -35,9 +35,7 @@ define float @call_nofpclass_funcs_f32(ptr addrspace(1) %ptr) {
; CHECK-NEXT: v_mov_b32_e32 v3, v0
; CHECK-NEXT: v_mov_b32_e32 v0, v2
; CHECK-NEXT: s_swappc_b64 s[30:31], s[16:17]
-; CHECK-NEXT: v_max_f32_e32 v1, v3, v3
-; CHECK-NEXT: v_max_f32_e32 v0, v0, v0
-; CHECK-NEXT: v_min_f32_e32 v0, v1, v0
+; CHECK-NEXT: v_min_f32_e32 v0, v3, v0
; CHECK-NEXT: v_readlane_b32 s31, v4, 1
; CHECK-NEXT: v_readlane_b32 s30, v4, 0
; CHECK-NEXT: s_mov_b32 s32, s33
@@ -87,12 +85,8 @@ define <2 x float> @call_nofpclass_funcs_v2f32(ptr addrspace(1) %ptr) {
; CHECK-NEXT: v_mov_b32_e32 v0, v3
; CHECK-NEXT: v_mov_b32_e32 v1, v2
; CHECK-NEXT: s_swappc_b64 s[30:31], s[16:17]
-; CHECK-NEXT: v_max_f32_e32 v2, v4, v4
-; CHECK-NEXT: v_max_f32_e32 v0, v0, v0
-; CHECK-NEXT: v_min_f32_e32 v0, v2, v0
-; CHECK-NEXT: v_max_f32_e32 v2, v5, v5
-; CHECK-NEXT: v_max_f32_e32 v1, v1, v1
-; CHECK-NEXT: v_min_f32_e32 v1, v2, v1
+; CHECK-NEXT: v_min_f32_e32 v0, v4, v0
+; CHECK-NEXT: v_min_f32_e32 v1, v5, v1
; CHECK-NEXT: v_readlane_b32 s31, v6, 1
; CHECK-NEXT: v_readlane_b32 s30, v6, 0
; CHECK-NEXT: s_mov_b32 s32, s33
@@ -142,12 +136,10 @@ define double @call_nofpclass_funcs_f64(ptr addrspace(1) %ptr) {
; CHECK-NEXT: v_mov_b32_e32 v0, v5
; CHECK-NEXT: v_mov_b32_e32 v1, v4
; CHECK-NEXT: s_swappc_b64 s[30:31], s[16:17]
-; CHECK-NEXT: v_max_f64 v[2:3], v[2:3], v[2:3]
-; CHECK-NEXT: v_max_f64 v[0:1], v[0:1], v[0:1]
+; CHECK-NEXT: v_min_f64 v[0:1], v[2:3], v[0:1]
; CHECK-NEXT: v_readlane_b32 s31, v6, 1
; CHECK-NEXT: v_readlane_b32 s30, v6, 0
; CHECK-NEXT: s_mov_b32 s32, s33
-; CHECK-NEXT: v_min_f64 v[0:1], v[2:3], v[0:1]
; CHECK-NEXT: s_xor_saveexec_b64 s[4:5], -1
; CHECK-NEXT: buffer_load_dword v6, off, s[0:3], s33 ; 4-byte Folded Reload
; CHECK-NEXT: s_mov_b64 exec, s[4:5]
|
This was referenced Nov 10, 2025
Base automatically changed from
users/arsenm/amdgpu/add-baseline-test-nofpclass-attr-call
to
main
November 10, 2025 16:04
This defends against regressions in future patches. This excludes the target intrinsic case for now; I'm worried introducing an intermediate AssertNoFPClass is likely to break combines.
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Hi @arsenm, The following starts crashing with this patch: |
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Reduced: |
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Fixed by #167725 |
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This defends against regressions in future patches. This excludes
the target intrinsic case for now; I'm worried introducing an intermediate
AssertNoFPClass is likely to break combines.