unroll-sroa.ll
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; RUN: opt -disable-verify -passes='default<O2>' -S < %s | FileCheck %s
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
; The local array %tmp can only be optimized away by sroa after loop unroll.
; CHECK-LABEL: define void @foo
; CHECK-NOT: alloca
; CHECK-NOT: call void @llvm.memcpy.p0i8.p0i8.i64
; Function Attrs: nounwind uwtable
define void @foo(i32* %a, i32* %b) {
entry:
%a.addr = alloca i32*, align 8
%b.addr = alloca i32*, align 8
%tmp = alloca [4 x float], align 16
%i = alloca i32, align 4
store i32* %a, i32** %a.addr, align 8
store i32* %b, i32** %b.addr, align 8
store i32 0, i32* %i, align 4
br label %for.cond
for.cond: ; preds = %for.inc, %entry
%iter2 = load i32, i32* %i, align 4
%cmp = icmp slt i32 %iter2, 4
br i1 %cmp, label %for.body, label %for.cond.cleanup
for.cond.cleanup: ; preds = %for.cond
br label %for.end
for.body: ; preds = %for.cond
%inptr = load i32*, i32** %a.addr, align 8
%idx2 = load i32, i32* %i, align 4
%idxprom = sext i32 %idx2 to i64
%arrayidx = getelementptr inbounds i32, i32* %inptr, i64 %idxprom
%val = load i32, i32* %arrayidx, align 4
%conv = sitofp i32 %val to float
%idx = load i32, i32* %i, align 4
%idxprom1 = sext i32 %idx to i64
%arrayidx2 = getelementptr inbounds [4 x float], [4 x float]* %tmp, i64 0, i64 %idxprom1
store float %conv, float* %arrayidx2, align 4
br label %for.inc
for.inc: ; preds = %for.body
%iter = load i32, i32* %i, align 4
%inc = add nsw i32 %iter, 1
store i32 %inc, i32* %i, align 4
br label %for.cond
for.end: ; preds = %for.cond.cleanup
%dstptr = load i32*, i32** %b.addr, align 8
%dst = bitcast i32* %dstptr to i8*
%arraydecay = getelementptr inbounds [4 x float], [4 x float]* %tmp, i64 0, i64 0
%src = bitcast float* %arraydecay to i8*
call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 4 %dst, i8* align 16 %src, i64 16, i1 false)
ret void
}
; Function Attrs: argmemonly nounwind willreturn
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* noalias nocapture writeonly, i8* noalias nocapture readonly, i64, i1 immarg)