llvm/test/CodeGen/Thumb2/2009-08-06-SpDecBug.ll
Evan Cheng 861986401e It turns out most of the thumb2 instructions are not allowed to touch SP. The semantics of such instructions are unpredictable. We have just been lucky that tests have been passing.
This patch takes pain to ensure all the PEI lowering code does the right thing when lowering frame indices, insert code to manipulate stack pointers, etc. It's also custom lowering dynamic stack alloc into pseudo instructions so we can insert the right instructions at scheduling time.

This fixes PR4659 and PR4682.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78361 91177308-0d34-0410-b5e6-96231b3b80d8
2009-08-07 00:34:42 +00:00

25 lines
688 B
LLVM

; RUN: llvm-as < %s | llc -mtriple=thumbv7-none-linux-gnueabi | FileCheck %s
; PR4659
; PR4682
define hidden arm_aapcscc i32 @__gcov_execlp(i8* %path, i8* %arg, ...) nounwind {
entry:
; CHECK: __gcov_execlp:
; CHECK: mov sp, r7
; CHECK: sub sp, #1 * 4
call arm_aapcscc void @__gcov_flush() nounwind
br i1 undef, label %bb5, label %bb
bb: ; preds = %bb, %entry
br i1 undef, label %bb5, label %bb
bb5: ; preds = %bb, %entry
%0 = alloca i8*, i32 undef, align 4 ; <i8**> [#uses=1]
%1 = call arm_aapcscc i32 @execvp(i8* %path, i8** %0) nounwind ; <i32> [#uses=1]
ret i32 %1
}
declare hidden arm_aapcscc void @__gcov_flush()
declare arm_aapcscc i32 @execvp(i8*, i8**) nounwind