| Quentin Colombet | 6443cce | 2015-08-06 18:44:34 +0000 | [diff] [blame] | 1 | ; RUN: opt -S -reassociate -die < %s | FileCheck %s |
| 2 | |
| 3 | ; The two va_arg instructions depend on the memory/context, are therfore not |
| 4 | ; identical and the sub should not be optimized to 0 by reassociate. |
| 5 | ; |
| Jonathan Roelofs | 49e46ce | 2015-08-10 19:01:27 +0000 | [diff] [blame] | 6 | ; CHECK-LABEL: @func( |
| Quentin Colombet | 6443cce | 2015-08-06 18:44:34 +0000 | [diff] [blame] | 7 | ; ... |
| 8 | ; CHECK: %v0 = va_arg i8** %varargs, i32 |
| 9 | ; CHECK: %v1 = va_arg i8** %varargs, i32 |
| 10 | ; CHECK: %v0.neg = sub i32 0, %v0 |
| 11 | ; CHECK: %sub = add i32 %v0.neg, 1 |
| 12 | ; CHECK: %add = add i32 %sub, %v1 |
| 13 | ; ... |
| 14 | ; CHECK: ret i32 %add |
| 15 | define i32 @func(i32 %dummy, ...) { |
| 16 | %varargs = alloca i8*, align 8 |
| 17 | %varargs1 = bitcast i8** %varargs to i8* |
| 18 | call void @llvm.va_start(i8* %varargs1) |
| 19 | %v0 = va_arg i8** %varargs, i32 |
| 20 | %v1 = va_arg i8** %varargs, i32 |
| 21 | %sub = sub nsw i32 %v1, %v0 |
| 22 | %add = add nsw i32 %sub, 1 |
| 23 | call void @llvm.va_end(i8* %varargs1) |
| 24 | ret i32 %add |
| 25 | } |
| 26 | |
| 27 | declare void @llvm.va_start(i8*) |
| 28 | declare void @llvm.va_end(i8*) |