[NVPTX] Prevent fptrunc of v2f32 from being folded into store #149571
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@llvm/pr-subscribers-backend-nvptx Author: Alex MacLean (AlexMaclean) ChangesFull diff: https://github.com/llvm/llvm-project/pull/149571.diff 2 Files Affected:
diff --git a/llvm/lib/Target/NVPTX/NVPTXISelLowering.cpp b/llvm/lib/Target/NVPTX/NVPTXISelLowering.cpp
index 7aa06f9079b09..4e7002feea215 100644
--- a/llvm/lib/Target/NVPTX/NVPTXISelLowering.cpp
+++ b/llvm/lib/Target/NVPTX/NVPTXISelLowering.cpp
@@ -731,6 +731,8 @@ NVPTXTargetLowering::NVPTXTargetLowering(const NVPTXTargetMachine &TM,
setTruncStoreAction(MVT::f32, MVT::bf16, Expand);
setTruncStoreAction(MVT::f64, MVT::bf16, Expand);
setTruncStoreAction(MVT::f64, MVT::f32, Expand);
+ setTruncStoreAction(MVT::v2f32, MVT::v2f16, Expand);
+ setTruncStoreAction(MVT::v2f32, MVT::v2bf16, Expand);
// PTX does not support load / store predicate registers
setOperationAction(ISD::LOAD, MVT::i1, Custom);
diff --git a/llvm/test/CodeGen/NVPTX/f32x2-instructions.ll b/llvm/test/CodeGen/NVPTX/f32x2-instructions.ll
index af3cb63082e78..f24428ebcfb8c 100644
--- a/llvm/test/CodeGen/NVPTX/f32x2-instructions.ll
+++ b/llvm/test/CodeGen/NVPTX/f32x2-instructions.ll
@@ -1957,6 +1957,41 @@ define <2 x float> @test_uitofp_2xi32_to_2xfloat(<2 x i32> %a) #0 {
ret <2 x float> %r
}
+define void @test_trunc_to_v2bf16(<2 x float> %a, ptr %p) {
+; CHECK-LABEL: test_trunc_to_v2bf16(
+; CHECK: {
+; CHECK-NEXT: .reg .b32 %r<4>;
+; CHECK-NEXT: .reg .b64 %rd<3>;
+; CHECK-EMPTY:
+; CHECK-NEXT: // %bb.0:
+; CHECK-NEXT: ld.param.b64 %rd2, [test_trunc_to_v2bf16_param_1];
+; CHECK-NEXT: ld.param.v2.b32 {%r1, %r2}, [test_trunc_to_v2bf16_param_0];
+; CHECK-NEXT: cvt.rn.bf16x2.f32 %r3, %r2, %r1;
+; CHECK-NEXT: st.b32 [%rd2], %r3;
+; CHECK-NEXT: ret;
+ %trunc = fptrunc <2 x float> %a to <2 x bfloat>
+ store <2 x bfloat> %trunc, ptr %p
+ ret void
+}
+
+define void @test_trunc_to_v2f16(<2 x float> %a, ptr %p) {
+; CHECK-LABEL: test_trunc_to_v2f16(
+; CHECK: {
+; CHECK-NEXT: .reg .b32 %r<4>;
+; CHECK-NEXT: .reg .b64 %rd<3>;
+; CHECK-EMPTY:
+; CHECK-NEXT: // %bb.0:
+; CHECK-NEXT: ld.param.b64 %rd2, [test_trunc_to_v2f16_param_1];
+; CHECK-NEXT: ld.param.v2.b32 {%r1, %r2}, [test_trunc_to_v2f16_param_0];
+; CHECK-NEXT: cvt.rn.f16x2.f32 %r3, %r2, %r1;
+; CHECK-NEXT: st.b32 [%rd2], %r3;
+; CHECK-NEXT: ret;
+ %trunc = fptrunc <2 x float> %a to <2 x half>
+ store <2 x half> %trunc, ptr %p
+ ret void
+}
+
+
attributes #0 = { nounwind }
attributes #1 = { "unsafe-fp-math" = "true" }
attributes #2 = { "denormal-fp-math"="preserve-sign" }
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Prince781
approved these changes
Jul 18, 2025
Artem-B
approved these changes
Jul 18, 2025
Prince781
approved these changes
Jul 18, 2025
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LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/185/builds/22430 Here is the relevant piece of the build log for the reference |
|
LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/137/builds/22636 Here is the relevant piece of the build log for the reference |
|
LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/33/builds/20554 Here is the relevant piece of the build log for the reference |
|
LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/153/builds/38648 Here is the relevant piece of the build log for the reference |
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