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