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llvm-mirror/test/CodeGen/X86/2010-07-02-asm-alignstack.ll
Evan Cheng 25f7df1bce Use pushq / popq instead of subq $8, %rsp / addq $8, %rsp to adjust stack in
prologue and epilogue if the adjustment is 8. Similarly, use pushl / popl if
the adjustment is 4 in 32-bit mode.

In the epilogue, takes care to pop to a caller-saved register that's not live
at the exit (either return or tailcall instruction).
rdar://8771137

llvm-svn: 122783
2011-01-03 22:53:22 +00:00

32 lines
1.2 KiB
LLVM

; RUN: llc < %s -mtriple=x86_64-apple-darwin10 | FileCheck %s
define void @foo() nounwind ssp {
entry:
; CHECK: foo
; CHECK: pushq
; CHECK: int $3
call void asm sideeffect alignstack "# top of block", "~{dirflag},~{fpsr},~{flags},~{edi},~{esi},~{edx},~{ecx},~{eax}"() nounwind
call void asm sideeffect alignstack ".file \22small.c\22", "~{dirflag},~{fpsr},~{flags}"() nounwind
call void asm sideeffect alignstack ".line 3", "~{dirflag},~{fpsr},~{flags}"() nounwind
call void asm sideeffect alignstack "int $$3", "~{dirflag},~{fpsr},~{flags},~{memory}"() nounwind
br label %return
return: ; preds = %entry
ret void
}
define void @bar() nounwind ssp {
entry:
; CHECK: bar
; CHECK-NOT: pushq
; CHECK: int $3
call void asm sideeffect "# top of block", "~{dirflag},~{fpsr},~{flags},~{edi},~{esi},~{edx},~{ecx},~{eax}"() nounwind
call void asm sideeffect ".file \22small.c\22", "~{dirflag},~{fpsr},~{flags}"() nounwind
call void asm sideeffect ".line 3", "~{dirflag},~{fpsr},~{flags}"() nounwind
call void asm sideeffect "int $$3", "~{dirflag},~{fpsr},~{flags},~{memory}"() nounwind
br label %return
return: ; preds = %entry
ret void
}