2017-08-08 03:56:34 +08:00
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; RUN: opt -mtriple=x86_64-unknown-linux-gnu -loop-reduce -lsr-insns-cost=false -S < %s | FileCheck %s
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2017-02-23 05:47:08 +08:00
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; Check LSR formula canonicalization will put loop invariant regs before
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; induction variable of current loop, so exprs involving loop invariant regs
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; can be promoted outside of current loop.
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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define void @foo(i32 %size, i32 %nsteps, i8* nocapture %maxarray, i8* nocapture readnone %buffer, i32 %init) local_unnamed_addr #0 {
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entry:
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%cmp25 = icmp sgt i32 %nsteps, 0
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br i1 %cmp25, label %for.cond1.preheader.lr.ph, label %for.end12
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for.cond1.preheader.lr.ph: ; preds = %entry
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%cmp223 = icmp sgt i32 %size, 1
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%t0 = sext i32 %init to i64
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%wide.trip.count = zext i32 %size to i64
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%wide.trip.count31 = zext i32 %nsteps to i64
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br label %for.cond1.preheader
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for.cond1.preheader: ; preds = %for.inc10, %for.cond1.preheader.lr.ph
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%indvars.iv28 = phi i64 [ 0, %for.cond1.preheader.lr.ph ], [ %indvars.iv.next29, %for.inc10 ]
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br i1 %cmp223, label %for.body3.lr.ph, label %for.inc10
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for.body3.lr.ph: ; preds = %for.cond1.preheader
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%t1 = add nsw i64 %indvars.iv28, %t0
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%t2 = trunc i64 %indvars.iv28 to i8
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br label %for.body3
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; Make sure loop invariant items are grouped together so that load address can
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; be represented in one getelementptr.
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; CHECK-LABEL: for.body3:
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; CHECK-NEXT: [[LSR:%[^,]+]] = phi i64 [ 1, %for.body3.lr.ph ], [ {{.*}}, %for.body3 ]
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; CHECK-NOT: = phi i64
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; CHECK-NEXT: [[LOADADDR:%[^,]+]] = getelementptr i8, i8* {{.*}}, i64 [[LSR]]
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; CHECK-NEXT: = load i8, i8* [[LOADADDR]], align 1
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; CHECK: br i1 %exitcond, label %for.inc10.loopexit, label %for.body3
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for.body3: ; preds = %for.body3, %for.body3.lr.ph
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%indvars.iv = phi i64 [ 1, %for.body3.lr.ph ], [ %indvars.iv.next, %for.body3 ]
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%t5 = trunc i64 %indvars.iv to i8
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%t3 = add nsw i64 %t1, %indvars.iv
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%arrayidx = getelementptr inbounds i8, i8* %maxarray, i64 %t3
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%t4 = load i8, i8* %arrayidx, align 1
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%add5 = add i8 %t4, %t5
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%add6 = add i8 %add5, %t2
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%arrayidx9 = getelementptr inbounds i8, i8* %maxarray, i64 %indvars.iv
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store i8 %add6, i8* %arrayidx9, align 1
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%exitcond = icmp eq i64 %indvars.iv.next, %wide.trip.count
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br i1 %exitcond, label %for.inc10.loopexit, label %for.body3
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for.inc10.loopexit: ; preds = %for.body3
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br label %for.inc10
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for.inc10: ; preds = %for.inc10.loopexit, %for.cond1.preheader
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%indvars.iv.next29 = add nuw nsw i64 %indvars.iv28, 1
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%exitcond32 = icmp eq i64 %indvars.iv.next29, %wide.trip.count31
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br i1 %exitcond32, label %for.end12.loopexit, label %for.cond1.preheader
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for.end12.loopexit: ; preds = %for.inc10
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br label %for.end12
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for.end12: ; preds = %for.end12.loopexit, %entry
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ret void
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}
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