File: ForceStackAlign.ll

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llvm-toolchain-17 1%3A17.0.6-22
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; Check that stack alignment can be forced. Individual targets should test their
; specific implementation details.

; RUN: llc < %s -stackrealign | FileCheck %s
; CHECK-LABEL: @f
; CHECK-LABEL: @g

; Stack realignment not supported.
; XFAIL: target=sparc{{.*}}

; NVPTX cannot select dynamic_stackalloc
; XFAIL: target=nvptx{{.*}}

define i32 @f(ptr %p) nounwind {
entry:
  %0 = load i8, ptr %p
  %conv = sext i8 %0 to i32
  ret i32 %conv
}

define i64 @g(i32 %i) nounwind {
entry:
  br label %if.then

if.then:
  %0 = alloca i8, i32 %i
  call void @llvm.memset.p0.i32(ptr %0, i8 0, i32 %i, i1 false)
  %call = call i32 @f(ptr %0)
  %conv = sext i32 %call to i64
  ret i64 %conv
}

declare void @llvm.memset.p0.i32(ptr, i8, i32, i1) nounwind

!llvm.module.flags = !{!0}
!0 = !{i32 2, !"override-stack-alignment", i32 32}