[PATCH] D17542: Disallow generating vzeroupper before return instruction (iret) in interrupt handler function

[Ahmed Bougacha via llvm-commits]

ab added a comment.

Sorry to be a nag, but the testcase can be simplified even further:

  ; RUN: llc -mtriple=x86_64-unknown-unknown -mattr=+avx < %s | FileCheck %s
  
  ; CHECK: vzeroupper
  ; CHECK-NEXT: call
  ; CHECK-NOT: vzeroupper
  ; CHECK: iret
  
  define x86_intrcc void @foo(i8* %frame) {
    call void @bar()
    ret void
  }
  
  declare void @bar()

FWIW, I also don't think the C reproducer adds any value, but if you think otherwise feel free to keep it!


http://reviews.llvm.org/D17542