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