29 lines
845 B
LLVM
29 lines
845 B
LLVM
; RUN: opt -S -reassociate -die < %s | FileCheck %s
|
|
|
|
; The two va_arg instructions depend on the memory/context, are therfore not
|
|
; identical and the sub should not be optimized to 0 by reassociate.
|
|
;
|
|
; CHECK-LABEL: @func(
|
|
; ...
|
|
; CHECK: %v0 = va_arg i8** %varargs, i32
|
|
; CHECK: %v1 = va_arg i8** %varargs, i32
|
|
; CHECK: %v0.neg = sub i32 0, %v0
|
|
; CHECK: %sub = add i32 %v0.neg, 1
|
|
; CHECK: %add = add i32 %sub, %v1
|
|
; ...
|
|
; CHECK: ret i32 %add
|
|
define i32 @func(i32 %dummy, ...) {
|
|
%varargs = alloca i8*, align 8
|
|
%varargs1 = bitcast i8** %varargs to i8*
|
|
call void @llvm.va_start(i8* %varargs1)
|
|
%v0 = va_arg i8** %varargs, i32
|
|
%v1 = va_arg i8** %varargs, i32
|
|
%sub = sub nsw i32 %v1, %v0
|
|
%add = add nsw i32 %sub, 1
|
|
call void @llvm.va_end(i8* %varargs1)
|
|
ret i32 %add
|
|
}
|
|
|
|
declare void @llvm.va_start(i8*)
|
|
declare void @llvm.va_end(i8*)
|