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https://github.com/c64scene-ar/llvm-6502.git
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011536a1cc
Summary: ScalarEvolutionExpander assumes that the header block of a loop is a legal place to have a use for a phi node. This is true only for phis that are either in the header or dominate the header block, but it is not true for phi nodes that are strictly internal to the loop body. This change teaches ScalarEvolutionExpander to place uses of PHI nodes in the basic block the PHI nodes belong to. This is always legal, and `hoistIVInc` ensures that the said position dominates `IsomorphicInc`. Reviewers: atrick Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D8311 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232189 91177308-0d34-0410-b5e6-96231b3b80d8
34 lines
954 B
LLVM
34 lines
954 B
LLVM
; RUN: opt -loop-reduce -verify < %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--linux-gnu"
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define void @unbounded() {
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block_A:
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%0 = sext i32 undef to i64
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br i1 undef, label %block_F, label %block_G
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block_C: ; preds = %block_F
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br i1 undef, label %block_D, label %block_E
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block_D: ; preds = %block_D, %block_C
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br i1 undef, label %block_E, label %block_D
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block_E: ; preds = %block_D, %block_C
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%iv2 = phi i64 [ %4, %block_D ], [ %4, %block_C ]
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%1 = add nsw i32 %iv1, 1
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%2 = icmp eq i32 %1, undef
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br i1 %2, label %block_G, label %block_F
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block_F: ; preds = %block_E, %block_A
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%iv3 = phi i64 [ %iv2, %block_E ], [ %0, %block_A ]
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%iv1 = phi i32 [ %1, %block_E ], [ undef, %block_A ]
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%3 = add nsw i64 %iv3, 2
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%4 = add nsw i64 %iv3, 1
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br label %block_C
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block_G: ; preds = %block_E, %block_A
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ret void
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}
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