| ; RUN: opt -loop-reduce -S < %s | FileCheck %s |
| ; Check when we use an outerloop induction variable inside of an innerloop |
| ; induction value expr, LSR can still choose to use single induction variable |
| ; for the innerloop and share it in multiple induction value exprs. |
| |
| target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" |
| target triple = "x86_64-unknown-linux-gnu" |
| |
| define void @foo(i32 %size, i32 %nsteps, i32 %hsize, i32* %lined, i8* %maxarray) { |
| entry: |
| %cmp215 = icmp sgt i32 %size, 1 |
| %t0 = zext i32 %size to i64 |
| %t1 = sext i32 %nsteps to i64 |
| %sub2 = sub i64 %t0, 2 |
| br label %for.body |
| |
| for.body: ; preds = %for.inc, %entry |
| %indvars.iv2 = phi i64 [ %indvars.iv.next3, %for.inc ], [ 0, %entry ] |
| %t2 = mul nsw i64 %indvars.iv2, %t0 |
| br i1 %cmp215, label %for.body2.preheader, label %for.inc |
| |
| for.body2.preheader: ; preds = %for.body |
| br label %for.body2 |
| |
| ; Check LSR only generates one induction variable for for.body2 and the induction |
| ; variable will be shared by multiple array accesses. |
| ; CHECK: for.body2: |
| ; CHECK-NEXT: [[LSR:%[^,]+]] = phi i64 [ %lsr.iv.next, %for.body2 ], [ 0, %for.body2.preheader ] |
| ; CHECK-NOT: = phi i64 [ {{.*}}, %for.body2 ], [ {{.*}}, %for.body2.preheader ] |
| ; CHECK: [[SCEVGEP1:%[^,]+]] = getelementptr i8, i8* %maxarray, i64 [[LSR]] |
| ; CHECK: [[SCEVGEP2:%[^,]+]] = getelementptr i8, i8* [[SCEVGEP1]], i64 1 |
| ; CHECK: {{.*}} = load i8, i8* [[SCEVGEP2]], align 1 |
| ; CHECK: [[SCEVGEP3:%[^,]+]] = getelementptr i8, i8* {{.*}}, i64 [[LSR]] |
| ; CHECK: {{.*}} = load i8, i8* [[SCEVGEP3]], align 1 |
| ; CHECK: [[SCEVGEP4:%[^,]+]] = getelementptr i8, i8* {{.*}}, i64 [[LSR]] |
| ; CHECK: store i8 {{.*}}, i8* [[SCEVGEP4]], align 1 |
| ; CHECK: br i1 %exitcond, label %for.body2, label %for.inc.loopexit |
| |
| for.body2: ; preds = %for.body2.preheader, %for.body2 |
| %indvars.iv = phi i64 [ 1, %for.body2.preheader ], [ %indvars.iv.next, %for.body2 ] |
| %arrayidx1 = getelementptr inbounds i8, i8* %maxarray, i64 %indvars.iv |
| %v1 = load i8, i8* %arrayidx1, align 1 |
| %idx2 = add nsw i64 %indvars.iv, %sub2 |
| %arrayidx2 = getelementptr inbounds i8, i8* %maxarray, i64 %idx2 |
| %v2 = load i8, i8* %arrayidx2, align 1 |
| %tmpv = xor i8 %v1, %v2 |
| %t4 = add nsw i64 %t2, %indvars.iv |
| %add.ptr = getelementptr inbounds i8, i8* %maxarray, i64 %t4 |
| store i8 %tmpv, i8* %add.ptr, align 1 |
| %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1 |
| %wide.trip.count = zext i32 %size to i64 |
| %exitcond = icmp ne i64 %indvars.iv.next, %wide.trip.count |
| br i1 %exitcond, label %for.body2, label %for.inc.loopexit |
| |
| for.inc.loopexit: ; preds = %for.body2 |
| br label %for.inc |
| |
| for.inc: ; preds = %for.inc.loopexit, %for.body |
| %indvars.iv.next3 = add nuw nsw i64 %indvars.iv2, 1 |
| %cmp = icmp slt i64 %indvars.iv.next3, %t1 |
| br i1 %cmp, label %for.body, label %for.end.loopexit |
| |
| for.end.loopexit: ; preds = %for.inc |
| ret void |
| } |
