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856f7f79e2
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
Reviewed By: lsaba
Subscribers: spatel, igorb, llvm-commits
Differential Revision: https://reviews.llvm.org/D35014
llvm-svn: 313343
71 lines
2.2 KiB
LLVM
71 lines
2.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=x86_64-unknown -mattr=+slow-3ops-lea | FileCheck %s -check-prefix=X64
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; RUN: llc < %s -mtriple=i686-unknown -mattr=+slow-3ops-lea | FileCheck %s -check-prefix=X86
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%struct.SA = type { i32 , i32 , i32 , i32 , i32};
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define void @foo(%struct.SA* nocapture %ctx, i32 %n) local_unnamed_addr #0 {
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; X64-LABEL: foo:
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; X64: # BB#0: # %entry
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; X64-NEXT: .p2align 4, 0x90
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; X64-NEXT: .LBB0_1: # %loop
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; X64-NEXT: # =>This Inner Loop Header: Depth=1
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; X64-NEXT: movl 16(%rdi), %eax
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; X64-NEXT: movl (%rdi), %ecx
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; X64-NEXT: addl %eax, %ecx
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; X64-NEXT: incl %ecx
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; X64-NEXT: movl %ecx, 12(%rdi)
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; X64-NEXT: decl %esi
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; X64-NEXT: jne .LBB0_1
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; X64-NEXT: # BB#2: # %exit
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; X64-NEXT: addl %eax, %ecx
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; X64-NEXT: movl %ecx, 16(%rdi)
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; X64-NEXT: retq
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;
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; X86-LABEL: foo:
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; X86: # BB#0: # %entry
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; X86-NEXT: pushl %esi
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; X86-NEXT: .Lcfi0:
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; X86-NEXT: .cfi_def_cfa_offset 8
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; X86-NEXT: .Lcfi1:
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; X86-NEXT: .cfi_offset %esi, -8
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; X86-NEXT: movl {{[0-9]+}}(%esp), %ecx
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; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
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; X86-NEXT: .p2align 4, 0x90
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; X86-NEXT: .LBB0_1: # %loop
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; X86-NEXT: # =>This Inner Loop Header: Depth=1
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; X86-NEXT: movl 16(%eax), %edx
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; X86-NEXT: movl (%eax), %esi
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; X86-NEXT: addl %edx, %esi
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; X86-NEXT: incl %esi
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; X86-NEXT: movl %esi, 12(%eax)
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; X86-NEXT: decl %ecx
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; X86-NEXT: jne .LBB0_1
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; X86-NEXT: # BB#2: # %exit
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; X86-NEXT: addl %edx, %esi
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; X86-NEXT: movl %esi, 16(%eax)
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; X86-NEXT: popl %esi
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; X86-NEXT: retl
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entry:
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br label %loop
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loop:
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%iter = phi i32 [%n ,%entry ] ,[ %iter.ctr ,%loop]
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%h0 = getelementptr inbounds %struct.SA, %struct.SA* %ctx, i64 0, i32 0
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%0 = load i32, i32* %h0, align 8
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%h3 = getelementptr inbounds %struct.SA, %struct.SA* %ctx, i64 0, i32 3
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%h4 = getelementptr inbounds %struct.SA, %struct.SA* %ctx, i64 0, i32 4
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%1 = load i32, i32* %h4, align 8
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%add = add i32 %0, 1
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%add4 = add i32 %add, %1
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store i32 %add4, i32* %h3, align 4
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%add29 = add i32 %add4, %1
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%iter.ctr = sub i32 %iter , 1
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%res = icmp ne i32 %iter.ctr , 0
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br i1 %res , label %loop , label %exit
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exit:
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store i32 %add29, i32* %h4, align 8
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ret void
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}
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