forked from OSchip/llvm-project
25 lines
701 B
LLVM
25 lines
701 B
LLVM
; ModuleID = 'test1.c'
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; RUN: opt -S -instcombine < %s | FileCheck %s
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target triple = "x86_64-apple-macosx10.6.6"
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define zeroext i16 @foo(i32 %on_off, i16* %puls) nounwind uwtable ssp {
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entry:
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%on_off.addr = alloca i32, align 4
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%puls.addr = alloca i16*, align 8
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%a = alloca i32, align 4
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store i32 %on_off, i32* %on_off.addr, align 4
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store i16* %puls, i16** %puls.addr, align 8
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%tmp = load i32* %on_off.addr, align 4
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; CHECK-NOT: sub
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; CHECK-NOT: mul
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; (1 - %tmp) * (-2) -> (%tmp - 1) * 2
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%sub = sub i32 1, %tmp
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%mul = mul i32 %sub, -2
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; CHECK: shl
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; CHECK-NEXT: add
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store i32 %mul, i32* %a, align 4
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%tmp1 = load i32* %a, align 4
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%conv = trunc i32 %tmp1 to i16
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ret i16 %conv
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}
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