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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -passes=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 ptr, align 8
; CHECK-NEXT: call void @llvm.va_start(ptr [[VARARGS]])
; CHECK-NEXT: [[V0:%.*]] = va_arg ptr [[VARARGS]], i32
; CHECK-NEXT: [[V1:%.*]] = va_arg ptr [[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(ptr [[VARARGS]])
; CHECK-NEXT: ret i32 [[ADD]]
;
%varargs = alloca ptr, align 8
call void @llvm.va_start(ptr %varargs)
%v0 = va_arg ptr %varargs, i32
%v1 = va_arg ptr %varargs, i32
%sub = sub nsw i32 %v1, %v0
%add = add nsw i32 %sub, 1
call void @llvm.va_end(ptr %varargs)
ret i32 %add
}
declare void @llvm.va_start(ptr)
declare void @llvm.va_end(ptr)
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