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 9target triple = "wasm32-unknown-unknown" 10 11; CHECK: i32.sub $[[BASE:[0-9]+]]=, 12; CHECK: local.copy $[[ARG:[0-9]+]]=, $0{{$}} 13; CHECK: i32.const $[[A0:[0-9]+]]=, 1{{$}} 14; CHECK: i32.and $[[A1:[0-9]+]]=, $[[ARG]], $[[A0]]{{$}} 15; CHECK: i32.store8 8($[[BASE]]), $[[A1]]{{$}} 16 17define void @test(i8 %byte) { 18 %t = alloca { i8, i8 }, align 8 19 %x4 = and i8 %byte, 1 20 %x5 = icmp eq i8 %x4, 1 21 %x6 = and i8 %byte, 2 22 %x7 = icmp eq i8 %x6, 2 23 %x9 = zext i1 %x5 to i8 24 store i8 %x9, ptr %t, align 1 25 %x10 = getelementptr inbounds { i8, i8 }, ptr %t, i32 0, i32 1 26 %x11 = zext i1 %x7 to i8 27 store i8 %x11, ptr %x10, align 1 28 ret void 29} 30