2017-09-18 02:16:26 +08:00
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu | FileCheck %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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@b = common local_unnamed_addr global i64 0, align 8
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@a = common local_unnamed_addr global i8 0, align 1
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; Function Attrs: norecurse nounwind uwtable
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define void @c() local_unnamed_addr #0 {
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; CHECK-LABEL: c:
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; CHECK: # BB#0: # %entry
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; CHECK-NEXT: movq {{.*}}(%rip), %rax
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; CHECK-NEXT: leaq (%rax,%rax,4), %rcx
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; CHECK-NEXT: negq %rcx
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Revert r314886 "[X86] Improvement in CodeGen instruction selection for LEAs (re-applying post required revision changes.)"
It broke the Chromium / SQLite build; see PR34830.
> Summary:
> 1/ Operand folding during complex pattern matching for LEAs has been
> extended, such that it promotes Scale to accommodate similar operand
> appearing in the DAG.
> e.g.
> T1 = A + B
> T2 = T1 + 10
> T3 = T2 + A
> For above DAG rooted at T3, X86AddressMode will no look like
> Base = B , Index = A , Scale = 2 , Disp = 10
>
> 2/ During OptimizeLEAPass down the pipeline factorization is now performed over LEAs
> so that if there is an opportunity then complex LEAs (having 3 operands)
> could be factored out.
> e.g.
> leal 1(%rax,%rcx,1), %rdx
> leal 1(%rax,%rcx,2), %rcx
> will be factored as following
> leal 1(%rax,%rcx,1), %rdx
> leal (%rdx,%rcx) , %edx
>
> 3/ Aggressive operand folding for AM based selection for LEAs is sensitive to loops,
> thus avoiding creation of any complex LEAs within a loop.
>
> Reviewers: lsaba, RKSimon, craig.topper, qcolombet, jmolloy
>
> Reviewed By: lsaba
>
> Subscribers: jmolloy, spatel, igorb, llvm-commits
>
> Differential Revision: https://reviews.llvm.org/D35014
llvm-svn: 314919
2017-10-05 01:54:06 +08:00
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; CHECK-NEXT: leaq (%rax,%rax,8), %rax
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2017-09-18 02:16:26 +08:00
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; CHECK-NEXT: leaq (%rax,%rax,4), %rax
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; CHECK-NEXT: testq %rax, %rcx
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; CHECK-NEXT: je .LBB0_2
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; CHECK-NEXT: # BB#1: # %if.then
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; CHECK-NEXT: movb $0, {{.*}}(%rip)
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; CHECK-NEXT: .LBB0_2: # %if.end
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; CHECK-NEXT: retq
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entry:
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%0 = load i64, i64* @b, align 8, !tbaa !2
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%mul = mul nsw i64 %0, -5
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%mul1 = mul nsw i64 %0, 45
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%and = and i64 %mul, %mul1
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%tobool = icmp eq i64 %and, 0
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br i1 %tobool, label %if.end, label %if.then
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if.then: ; preds = %entry
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store i8 0, i8* @a, align 1, !tbaa !6
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br label %if.end
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if.end: ; preds = %entry, %if.then
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ret void
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}
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attributes #0 = { norecurse nounwind uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
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!llvm.module.flags = !{!0}
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!llvm.ident = !{!1}
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!0 = !{i32 1, !"wchar_size", i32 4}
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!1 = !{!"clang version 6.0.0 "}
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!2 = !{!3, !3, i64 0}
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!3 = !{!"long", !4, i64 0}
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!4 = !{!"omnipotent char", !5, i64 0}
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!5 = !{!"Simple C/C++ TBAA"}
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!6 = !{!4, !4, i64 0}
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