| Thomas Lively | 2a47e03 | 2019-01-14 22:03:43 +0000 | [diff] [blame] | 1 | ; RUN: llc < %s -O0 -wasm-disable-explicit-locals -wasm-keep-registers | FileCheck %s |
| 2 | |
| 3 | ; Regression test for bug 40172. The problem was that FastISel assumed |
| 4 | ; that CmpInst results did not need to be zero extended because |
| 5 | ; WebAssembly's compare instructions always return 0 or 1. But in this |
| 6 | ; test case FastISel falls back to DAG ISel, which combines away the |
| 7 | ; comparison, invalidating FastISel's assumption. |
| 8 | |
| 9 | target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128" |
| 10 | target triple = "wasm32-unknown-unknown" |
| 11 | |
| 12 | ; CHECK: i32.sub $[[BASE:[0-9]+]]=, |
| 13 | ; CHECK: local.copy $[[ARG:[0-9]+]]=, $0{{$}} |
| 14 | ; CHECK: i32.const $[[A0:[0-9]+]]=, 1{{$}} |
| 15 | ; CHECK: i32.and $[[A1:[0-9]+]]=, $[[ARG]], $[[A0]]{{$}} |
| 16 | ; CHECK: i32.store8 8($[[BASE]]), $[[A1]]{{$}} |
| 17 | |
| 18 | define void @test(i8 %byte) { |
| 19 | %t = alloca { i8, i8 }, align 1 |
| 20 | %x4 = and i8 %byte, 1 |
| 21 | %x5 = icmp eq i8 %x4, 1 |
| 22 | %x6 = and i8 %byte, 2 |
| 23 | %x7 = icmp eq i8 %x6, 2 |
| 24 | %x8 = bitcast { i8, i8 }* %t to i8* |
| 25 | %x9 = zext i1 %x5 to i8 |
| 26 | store i8 %x9, i8* %x8, align 1 |
| 27 | %x10 = getelementptr inbounds { i8, i8 }, { i8, i8 }* %t, i32 0, i32 1 |
| 28 | %x11 = zext i1 %x7 to i8 |
| 29 | store i8 %x11, i8* %x10, align 1 |
| 30 | ret void |
| 31 | } |