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Fix ScalarEvolutionExpander step scaling bug
The expandAddRecExprLiterally function incorrectly transforms `[Start + Step * X]` into `Step * [Start + X]` instead of the correct transform of `[Step * X] + Start`. This caused JuliaLang/julia#14704 (comment) due to what appeared to be sufficiently complicated loop interactions. Patch by Jameson Nash ([email protected]). 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
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; RUN: opt -S -loop-reduce < %s | FileCheck %s | ||
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target triple = "x86_64-unknown-unknown" | ||
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*) { | ||
top: | ||
br label %L | ||
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L: ; preds = %idxend.10, %idxend, %L2, %top | ||
br i1 undef, label %L, label %L1 | ||
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L1: ; preds = %L1.preheader, %L2 | ||
%r13 = phi i64 [ %r1, %L2 ], [ 1, %L ] | ||
; CHECK: %lsr.iv = phi i64 [ 0, %L{{[^ ]+}} ], [ %lsr.iv.next, %L2 ] | ||
; CHECK-NOT: %lsr.iv = phi i64 [ -1, %L{{[^ ]+}} ], [ %lsr.iv.next, %L2 ] | ||
; CHECK: br | ||
%r0 = add i64 %r13, -1 | ||
br label %idxend.8 | ||
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L2: ; preds = %idxend.8 | ||
%r1 = add i64 %r13, 1 | ||
br i1 undef, label %L, label %L1 | ||
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if6: ; preds = %idxend.8 | ||
%r2 = add i64 %0, -1 | ||
%r3 = load i64, i64* %1, align 8 | ||
; CHECK-NOT: %r2 | ||
; CHECK: %r3 = load i64 | ||
br label %ib | ||
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idxend.8: ; preds = %L1 | ||
br i1 undef, label %if6, label %L2 | ||
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ib: ; preds = %if6 | ||
%r4 = mul i64 %r3, %r0 | ||
%r5 = add i64 %r2, %r4 | ||
%r6 = icmp ult i64 %r5, undef | ||
; CHECK %2 = mul i64 %lsr.iv, %r3 | ||
; CHECK %3 = add i64 %1, -1 | ||
; CHECK %4 = add i64 %0, %r3 | ||
; CHECK %r6 | ||
%r7 = getelementptr i64, i64* undef, i64 %r5 | ||
store i64 1, i64* %r7, align 8 | ||
; CHECK %5 = mul i64 %lsr.iv, %r3 | ||
; CHECK %6 = add i64 %5, -1 | ||
br label %L | ||
} |