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c8ce9e59a8
The expandAddRecExprLiterally function incorrectly transforms `[Start + Step * X]` into `Step * [Start + X]` instead of the correct transform of `[Step * X] + Start`. This caused https://github.com/JuliaLang/julia/issues/14704#issuecomment-174126219 due to what appeared to be sufficiently complicated loop interactions. Patch by Jameson Nash (jameson@juliacomputing.com). Reviewers: sanjoy Differential Revision: http://reviews.llvm.org/D16505 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@275239 91177308-0d34-0410-b5e6-96231b3b80d8
49 lines
1.5 KiB
LLVM
49 lines
1.5 KiB
LLVM
; RUN: opt -S -loop-reduce < %s | FileCheck %s
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target triple = "x86_64-unknown-unknown"
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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define void @incorrect_offset_scaling(i64, i64*) {
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top:
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br label %L
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L: ; preds = %idxend.10, %idxend, %L2, %top
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br i1 undef, label %L, label %L1
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L1: ; preds = %L1.preheader, %L2
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%r13 = phi i64 [ %r1, %L2 ], [ 1, %L ]
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; CHECK: %lsr.iv = phi i64 [ 0, %L{{[^ ]+}} ], [ %lsr.iv.next, %L2 ]
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; CHECK-NOT: %lsr.iv = phi i64 [ -1, %L{{[^ ]+}} ], [ %lsr.iv.next, %L2 ]
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; CHECK: br
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%r0 = add i64 %r13, -1
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br label %idxend.8
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L2: ; preds = %idxend.8
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%r1 = add i64 %r13, 1
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br i1 undef, label %L, label %L1
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if6: ; preds = %idxend.8
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%r2 = add i64 %0, -1
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%r3 = load i64, i64* %1, align 8
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; CHECK-NOT: %r2
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; CHECK: %r3 = load i64
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br label %ib
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idxend.8: ; preds = %L1
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br i1 undef, label %if6, label %L2
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ib: ; preds = %if6
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%r4 = mul i64 %r3, %r0
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%r5 = add i64 %r2, %r4
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%r6 = icmp ult i64 %r5, undef
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; CHECK %2 = mul i64 %lsr.iv, %r3
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; CHECK %3 = add i64 %1, -1
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; CHECK %4 = add i64 %0, %r3
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; CHECK %r6
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%r7 = getelementptr i64, i64* undef, i64 %r5
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store i64 1, i64* %r7, align 8
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; CHECK %5 = mul i64 %lsr.iv, %r3
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; CHECK %6 = add i64 %5, -1
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br label %L
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}
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