[Mlir-commits] [mlir] [mlir][LLVM] add llvm.fake.use to LLVM dialect (PR #187026)

[llvmlistbot at llvm.org]

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@@ -724,6 +724,19 @@ define void @va_intrinsics_test(ptr %0, ptr %1, ...) {
   ret void
 }
 
+; CHECK-LABEL: @fake_use
+; CHECK-SAME:  %[[VAL:[a-zA-Z0-9]+]]
+; CHECK-SAME:  %[[PTR:[a-zA-Z0-9]+]]
+define void @fake_use(i32 %0, ptr %1) {
+  ; CHECK: llvm.intr.fake.use %[[VAL]] : i32
+  call void (...) @llvm.fake.use(i32 %0)
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jeanPerier wrote:

Thanks for the review. As far as I can see it is not added when exporting to LLVM, so LLVM intrinsic builder is not adding it. I do not need it in MLIR, and for my use case at O0 I think it may be fine to not emit it in the LLVM IR.

@SLTozer, is the `notail` attribute mandatory on calls to llvm.fake.use?

https://github.com/llvm/llvm-project/pull/187026