| ; 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*) |
