| Evgeny Stupachenko | c675290 | 2017-08-07 19:56:34 +0000 | [diff] [blame] | 1 | ; RUN: opt -mtriple=x86_64-unknown-linux-gnu -loop-reduce -lsr-insns-cost=false -S < %s | FileCheck %s |
| Wei Mi | 74d5a90 | 2017-02-22 21:47:08 +0000 | [diff] [blame] | 2 | ; Check LSR formula canonicalization will put loop invariant regs before |
| 3 | ; induction variable of current loop, so exprs involving loop invariant regs |
| 4 | ; can be promoted outside of current loop. |
| 5 | |
| 6 | target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" |
| 7 | |
| 8 | define void @foo(i32 %size, i32 %nsteps, i8* nocapture %maxarray, i8* nocapture readnone %buffer, i32 %init) local_unnamed_addr #0 { |
| 9 | entry: |
| 10 | %cmp25 = icmp sgt i32 %nsteps, 0 |
| 11 | br i1 %cmp25, label %for.cond1.preheader.lr.ph, label %for.end12 |
| 12 | |
| 13 | for.cond1.preheader.lr.ph: ; preds = %entry |
| 14 | %cmp223 = icmp sgt i32 %size, 1 |
| 15 | %t0 = sext i32 %init to i64 |
| 16 | %wide.trip.count = zext i32 %size to i64 |
| 17 | %wide.trip.count31 = zext i32 %nsteps to i64 |
| 18 | br label %for.cond1.preheader |
| 19 | |
| 20 | for.cond1.preheader: ; preds = %for.inc10, %for.cond1.preheader.lr.ph |
| 21 | %indvars.iv28 = phi i64 [ 0, %for.cond1.preheader.lr.ph ], [ %indvars.iv.next29, %for.inc10 ] |
| 22 | br i1 %cmp223, label %for.body3.lr.ph, label %for.inc10 |
| 23 | |
| 24 | for.body3.lr.ph: ; preds = %for.cond1.preheader |
| 25 | %t1 = add nsw i64 %indvars.iv28, %t0 |
| 26 | %t2 = trunc i64 %indvars.iv28 to i8 |
| 27 | br label %for.body3 |
| 28 | |
| 29 | ; Make sure loop invariant items are grouped together so that load address can |
| 30 | ; be represented in one getelementptr. |
| 31 | ; CHECK-LABEL: for.body3: |
| 32 | ; CHECK-NEXT: [[LSR:%[^,]+]] = phi i64 [ 1, %for.body3.lr.ph ], [ {{.*}}, %for.body3 ] |
| 33 | ; CHECK-NOT: = phi i64 |
| 34 | ; CHECK-NEXT: [[LOADADDR:%[^,]+]] = getelementptr i8, i8* {{.*}}, i64 [[LSR]] |
| 35 | ; CHECK-NEXT: = load i8, i8* [[LOADADDR]], align 1 |
| 36 | ; CHECK: br i1 %exitcond, label %for.inc10.loopexit, label %for.body3 |
| 37 | |
| 38 | for.body3: ; preds = %for.body3, %for.body3.lr.ph |
| 39 | %indvars.iv = phi i64 [ 1, %for.body3.lr.ph ], [ %indvars.iv.next, %for.body3 ] |
| 40 | %t5 = trunc i64 %indvars.iv to i8 |
| 41 | %t3 = add nsw i64 %t1, %indvars.iv |
| 42 | %arrayidx = getelementptr inbounds i8, i8* %maxarray, i64 %t3 |
| 43 | %t4 = load i8, i8* %arrayidx, align 1 |
| 44 | %add5 = add i8 %t4, %t5 |
| 45 | %add6 = add i8 %add5, %t2 |
| 46 | %arrayidx9 = getelementptr inbounds i8, i8* %maxarray, i64 %indvars.iv |
| 47 | store i8 %add6, i8* %arrayidx9, align 1 |
| 48 | %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1 |
| 49 | %exitcond = icmp eq i64 %indvars.iv.next, %wide.trip.count |
| 50 | br i1 %exitcond, label %for.inc10.loopexit, label %for.body3 |
| 51 | |
| 52 | for.inc10.loopexit: ; preds = %for.body3 |
| 53 | br label %for.inc10 |
| 54 | |
| 55 | for.inc10: ; preds = %for.inc10.loopexit, %for.cond1.preheader |
| 56 | %indvars.iv.next29 = add nuw nsw i64 %indvars.iv28, 1 |
| 57 | %exitcond32 = icmp eq i64 %indvars.iv.next29, %wide.trip.count31 |
| 58 | br i1 %exitcond32, label %for.end12.loopexit, label %for.cond1.preheader |
| 59 | |
| 60 | for.end12.loopexit: ; preds = %for.inc10 |
| 61 | br label %for.end12 |
| 62 | |
| 63 | for.end12: ; preds = %for.end12.loopexit, %entry |
| 64 | ret void |
| 65 | } |