f3fea0f11f
We currently support LCSSA PHI nodes in the outer loop exit, if their incoming values do not come from the outer loop latch or if the outer loop latch has a single predecessor. In that case, the outer loop latch will be executed only if the inner loop gets executed. If we have multiple predecessors for the outer loop latch, it may be executed even if the inner loop does not get executed. This is a first step to support the case described in https://bugs.llvm.org/show_bug.cgi?id=30472 Reviewers: efriedma, karthikthecool, mcrosier Reviewed By: efriedma Differential Revision: https://reviews.llvm.org/D43237 llvm-svn: 331037
172 lines
5.4 KiB
LLVM
172 lines
5.4 KiB
LLVM
; RUN: opt < %s -basicaa -loop-interchange -pass-remarks-missed='loop-interchange' -pass-remarks-output=%t
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; RUN: cat %t | FileCheck --check-prefix REMARK %s
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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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@A = common global [100 x [100 x i32]] zeroinitializer
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@C = common global [100 x [100 x i32]] zeroinitializer
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@X = common global i32 0
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@Y = common global i64 0
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@F = common global float 0.0
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; We cannot interchange this loop at the moment, because iv.outer.next is
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; produced in the outer loop latch and used in the loop exit block. If the inner
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; loop body is not executed, the outer loop latch won't be executed either
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; after interchanging.
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; REMARK: UnsupportedExitPHI
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; REMARK-NEXT: lcssa_01
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define void @lcssa_01(){
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entry:
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%cmp21 = icmp sgt i64 100, 1
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br i1 %cmp21, label %outer.ph, label %for.end16
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outer.ph:
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%cmp218 = icmp sgt i64 100, 1
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br label %outer.header
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outer.header:
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%iv.outer= phi i64 [ 1, %outer.ph ], [ %iv.outer.next, %outer.inc ]
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br i1 %cmp218, label %for.body3, label %outer.inc
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for.body3:
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%iv.inner = phi i64 [ %iv.inner.next, %for.body3 ], [ 1, %outer.header ]
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%arrayidx5 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %iv.inner, i64 %iv.outer
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%vA = load i32, i32* %arrayidx5
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%arrayidx9 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @C, i64 0, i64 %iv.inner, i64 %iv.outer
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%vC = load i32, i32* %arrayidx9
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%add = add nsw i32 %vA, %vC
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store i32 %add, i32* %arrayidx5
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%iv.inner.next = add nuw nsw i64 %iv.inner, 1
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%exitcond = icmp eq i64 %iv.inner.next, 100
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br i1 %exitcond, label %outer.inc, label %for.body3
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outer.inc:
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%iv.outer.next = add nsw i64 %iv.outer, 1
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%cmp = icmp eq i64 %iv.outer.next, 100
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br i1 %cmp, label %outer.header, label %for.exit
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for.exit:
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store i64 %iv.outer.next, i64 * @Y
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br label %for.end16
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for.end16:
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ret void
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}
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; REMARK: UnsupportedExitPHI
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; REMARK-NEXT: lcssa_02
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define void @lcssa_02(){
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entry:
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%cmp21 = icmp sgt i64 100, 1
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br i1 %cmp21, label %outer.ph, label %for.end16
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outer.ph:
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%cmp218 = icmp sgt i64 100, 1
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br label %outer.header
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outer.header:
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%iv.outer= phi i64 [ 1, %outer.ph ], [ %iv.outer.next, %outer.inc ]
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br i1 %cmp218, label %for.body3, label %outer.inc
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for.body3:
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%iv.inner = phi i64 [ %iv.inner.next, %for.body3 ], [ 1, %outer.header ]
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%arrayidx5 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %iv.inner, i64 %iv.outer
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%vA = load i32, i32* %arrayidx5
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%arrayidx9 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @C, i64 0, i64 %iv.inner, i64 %iv.outer
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%vC = load i32, i32* %arrayidx9
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%add = add nsw i32 %vA, %vC
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store i32 %add, i32* %arrayidx5
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%iv.inner.next = add nuw nsw i64 %iv.inner, 1
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%exitcond = icmp eq i64 %iv.inner.next, 100
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br i1 %exitcond, label %outer.inc, label %for.body3
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outer.inc:
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%iv.inner.end = phi i64 [ 0, %outer.header ], [ %iv.inner.next, %for.body3 ]
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%iv.outer.next = add nsw i64 %iv.outer, 1
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%cmp = icmp eq i64 %iv.outer.next, 100
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br i1 %cmp, label %outer.header, label %for.exit
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for.exit:
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store i64 %iv.inner.end, i64 * @Y
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br label %for.end16
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for.end16:
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ret void
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}
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; REMARK: Interchanged
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; REMARK-NEXT: lcssa_03
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define void @lcssa_03(){
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entry:
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br label %outer.header
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outer.header:
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%iv.outer= phi i64 [ 1, %entry ], [ %iv.outer.next, %outer.inc ]
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br label %for.body3
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for.body3:
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%iv.inner = phi i64 [ %iv.inner.next, %for.body3 ], [ 1, %outer.header ]
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%arrayidx5 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %iv.inner, i64 %iv.outer
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%vA = load i32, i32* %arrayidx5
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%arrayidx9 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @C, i64 0, i64 %iv.inner, i64 %iv.outer
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%vC = load i32, i32* %arrayidx9
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%add = add nsw i32 %vA, %vC
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store i32 %add, i32* %arrayidx5
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%iv.inner.next = add nuw nsw i64 %iv.inner, 1
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%exitcond = icmp eq i64 %iv.inner.next, 100
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br i1 %exitcond, label %outer.inc, label %for.body3
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outer.inc:
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%iv.outer.next = add nsw i64 %iv.outer, 1
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%cmp = icmp eq i64 %iv.outer.next, 100
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br i1 %cmp, label %outer.header, label %for.exit
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for.exit:
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store i64 %iv.inner, i64 * @Y
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br label %for.end16
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for.end16:
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ret void
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}
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; FIXME: We currently do not support LCSSA phi nodes involving floating point
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; types, as we fail to detect floating point reductions for now.
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; REMARK: UnsupportedPHIOuter
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; REMARK-NEXT: lcssa_04
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define void @lcssa_04(){
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entry:
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br label %outer.header
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outer.header:
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%iv.outer= phi i64 [ 1, %entry ], [ %iv.outer.next, %outer.inc ]
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%float.outer= phi float [ 1.0, %entry ], [ 2.0, %outer.inc ]
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br label %for.body3
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for.body3:
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%iv.inner = phi i64 [ %iv.inner.next, %for.body3 ], [ 1, %outer.header ]
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%arrayidx5 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %iv.inner, i64 %iv.outer
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%vA = load i32, i32* %arrayidx5
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%arrayidx9 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @C, i64 0, i64 %iv.inner, i64 %iv.outer
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%vC = load i32, i32* %arrayidx9
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%add = add nsw i32 %vA, %vC
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store i32 %add, i32* %arrayidx5
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%iv.inner.next = add nuw nsw i64 %iv.inner, 1
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%exitcond = icmp eq i64 %iv.inner.next, 100
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br i1 %exitcond, label %outer.inc, label %for.body3
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outer.inc:
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%iv.outer.next = add nsw i64 %iv.outer, 1
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%cmp = icmp eq i64 %iv.outer.next, 100
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br i1 %cmp, label %outer.header, label %for.exit
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for.exit:
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store float %float.outer, float* @F
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br label %for.end16
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for.end16:
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ret void
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}
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