66 lines
2.1 KiB
LLVM
66 lines
2.1 KiB
LLVM
; RUN: opt < %s -O1 -S | FileCheck %s
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.10.0"
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@a = internal global [3 x i32] zeroinitializer, align 4
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@b = common global i32 0, align 4
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; The important thing we're checking for here is the reload of (some element of)
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; @a after the memset.
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; CHECK-LABEL: @main
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; CHECK: call void @llvm.memset.p0i8.i64{{.*}} @a
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; CHECK: store i32 3
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; CHECK: load i32, i32* getelementptr {{.*}} @a
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; CHECK: icmp eq i32
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; CHECK: br i1
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define i32 @main() {
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entry:
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%retval = alloca i32, align 4
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%c = alloca [1 x i32], align 4
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store i32 0, i32* %retval, align 4
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%0 = bitcast [1 x i32]* %c to i8*
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call void @llvm.memset.p0i8.i64(i8* align 4 %0, i8 0, i64 4, i1 false)
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store i32 1, i32* getelementptr inbounds ([3 x i32], [3 x i32]* @a, i64 0, i64 2), align 4
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store i32 0, i32* @b, align 4
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br label %for.cond
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for.cond: ; preds = %for.inc, %entry
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%1 = load i32, i32* @b, align 4
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%cmp = icmp slt i32 %1, 3
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br i1 %cmp, label %for.body, label %for.end
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for.body: ; preds = %for.cond
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%2 = load i32, i32* @b, align 4
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%idxprom = sext i32 %2 to i64
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%arrayidx = getelementptr inbounds [3 x i32], [3 x i32]* @a, i64 0, i64 %idxprom
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store i32 0, i32* %arrayidx, align 4
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br label %for.inc
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for.inc: ; preds = %for.body
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%3 = load i32, i32* @b, align 4
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%inc = add nsw i32 %3, 1
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store i32 %inc, i32* @b, align 4
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br label %for.cond
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for.end: ; preds = %for.cond
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%4 = load i32, i32* getelementptr inbounds ([3 x i32], [3 x i32]* @a, i64 0, i64 2), align 4
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%cmp1 = icmp ne i32 %4, 0
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br i1 %cmp1, label %if.then, label %if.end
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if.then: ; preds = %for.end
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call void @abort() #3
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unreachable
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if.end: ; preds = %for.end
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ret i32 0
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}
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; Function Attrs: nounwind argmemonly
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declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i1) nounwind argmemonly
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; Function Attrs: noreturn nounwind
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declare void @abort() noreturn nounwind
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