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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -reassociate -dce < %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.
;
; ...
; ...
define i32 @func(i32 %dummy, ...) {
;
; CHECK-LABEL: @func(
; CHECK-NEXT: [[VARARGS:%.*]] = alloca i8*, align 8
; CHECK-NEXT: [[VARARGS1:%.*]] = bitcast i8** [[VARARGS]] to i8*
; CHECK-NEXT: call void @llvm.va_start(i8* [[VARARGS1]])
; CHECK-NEXT: [[V0:%.*]] = va_arg i8** [[VARARGS]], i32
; CHECK-NEXT: [[V1:%.*]] = va_arg i8** [[VARARGS]], i32
; CHECK-NEXT: [[V0_NEG:%.*]] = sub i32 0, [[V0]]
; CHECK-NEXT: [[SUB:%.*]] = add i32 [[V0_NEG]], 1
; CHECK-NEXT: [[ADD:%.*]] = add i32 [[SUB]], [[V1]]
; CHECK-NEXT: call void @llvm.va_end(i8* [[VARARGS1]])
; CHECK-NEXT: ret i32 [[ADD]]
;
%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*)
|
