[llvm] AMDGPU: Add is_fpclass to isBoolSGPR (PR #141801)
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Wed May 28 09:42:16 PDT 2025
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-backend-amdgpu
Author: Matt Arsenault (arsenm)
<details>
<summary>Changes</summary>
---
Full diff: https://github.com/llvm/llvm-project/pull/141801.diff
2 Files Affected:
- (modified) llvm/lib/Target/AMDGPU/SIISelLowering.cpp (+1)
- (modified) llvm/test/CodeGen/AMDGPU/combine-and-sext-bool.ll (+25)
``````````diff
diff --git a/llvm/lib/Target/AMDGPU/SIISelLowering.cpp b/llvm/lib/Target/AMDGPU/SIISelLowering.cpp
index ade88a16193b8..c9fd2948d669f 100644
--- a/llvm/lib/Target/AMDGPU/SIISelLowering.cpp
+++ b/llvm/lib/Target/AMDGPU/SIISelLowering.cpp
@@ -11908,6 +11908,7 @@ bool llvm::isBoolSGPR(SDValue V) {
default:
break;
case ISD::SETCC:
+ case ISD::IS_FPCLASS:
case AMDGPUISD::FP_CLASS:
return true;
case ISD::AND:
diff --git a/llvm/test/CodeGen/AMDGPU/combine-and-sext-bool.ll b/llvm/test/CodeGen/AMDGPU/combine-and-sext-bool.ll
index b763bec89eef3..bdad6f40480d3 100644
--- a/llvm/test/CodeGen/AMDGPU/combine-and-sext-bool.ll
+++ b/llvm/test/CodeGen/AMDGPU/combine-and-sext-bool.ll
@@ -20,6 +20,31 @@ bb:
ret void
}
+; GCN-LABEL: {{^}}and_sext_bool_fcmp:
+; GCN: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GCN-NEXT: v_cmp_eq_f32_e32 vcc, 0, v0
+; GCN-NEXT: v_cndmask_b32_e32 v0, 0, v1, vcc
+; GCN-NEXT: s_setpc_b64
+define i32 @and_sext_bool_fcmp(float %x, i32 %y) {
+ %cmp = fcmp oeq float %x, 0.0
+ %sext = sext i1 %cmp to i32
+ %and = and i32 %sext, %y
+ ret i32 %and
+}
+
+; GCN-LABEL: {{^}}and_sext_bool_fpclass:
+; GCN: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GCN-NEXT: v_mov_b32_e32 [[K:v[0-9]+]], 0x7b
+; GCN-NEXT: v_cmp_class_f32_e32 vcc, v0, [[K]]
+; GCN-NEXT: v_cndmask_b32_e32 v0, 0, v1, vcc
+; GCN-NEXT: s_setpc_b64
+define i32 @and_sext_bool_fpclass(float %x, i32 %y) {
+ %class = call i1 @llvm.is.fpclass(float %x, i32 123)
+ %sext = sext i1 %class to i32
+ %and = and i32 %sext, %y
+ ret i32 %and
+}
+
declare i32 @llvm.amdgcn.workitem.id.x() #0
declare i32 @llvm.amdgcn.workitem.id.y() #0
``````````
</details>
https://github.com/llvm/llvm-project/pull/141801
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