forked from OSchip/llvm-project
66 lines
3.0 KiB
LLVM
66 lines
3.0 KiB
LLVM
; 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
|
|
}
|