forked from OSchip/llvm-project
32 lines
1.1 KiB
LLVM
32 lines
1.1 KiB
LLVM
; RUN: llc < %s -O0 -wasm-disable-explicit-locals -wasm-keep-registers | FileCheck %s
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; Regression test for bug 40172. The problem was that FastISel assumed
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; that CmpInst results did not need to be zero extended because
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; WebAssembly's compare instructions always return 0 or 1. But in this
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; test case FastISel falls back to DAG ISel, which combines away the
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; comparison, invalidating FastISel's assumption.
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target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
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target triple = "wasm32-unknown-unknown"
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; CHECK: i32.sub $[[BASE:[0-9]+]]=,
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; CHECK: local.copy $[[ARG:[0-9]+]]=, $0{{$}}
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; CHECK: i32.const $[[A0:[0-9]+]]=, 1{{$}}
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; CHECK: i32.and $[[A1:[0-9]+]]=, $[[ARG]], $[[A0]]{{$}}
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; CHECK: i32.store8 8($[[BASE]]), $[[A1]]{{$}}
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define void @test(i8 %byte) {
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%t = alloca { i8, i8 }, align 1
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%x4 = and i8 %byte, 1
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%x5 = icmp eq i8 %x4, 1
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%x6 = and i8 %byte, 2
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%x7 = icmp eq i8 %x6, 2
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%x8 = bitcast { i8, i8 }* %t to i8*
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%x9 = zext i1 %x5 to i8
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store i8 %x9, i8* %x8, align 1
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%x10 = getelementptr inbounds { i8, i8 }, { i8, i8 }* %t, i32 0, i32 1
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%x11 = zext i1 %x7 to i8
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store i8 %x11, i8* %x10, align 1
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ret void
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}
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