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A DAGCombine optimization for merging consecutive stores. This optimization is not profitable in many cases

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because moden processos can store multiple values in parallel, and preparing the consecutive store requires
some work.  We only handle these cases:

1. Consecutive stores where the values and consecutive loads. For example:
 int a = p->a;
 int b = p->b;
 q->a = a;
 q->b = b;

2. Consecutive stores where the values are constants. Foe example:
 q->a = 4;
 q->b = 5;



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164910 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem
2012-09-30 06:24:14 +00:00
parent eb1641d54a
commit e5f163a3b9
5 changed files with 412 additions and 12 deletions
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5
test/CodeGen/X86/loop-strength-reduce.ll
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@@ -1,8 +1,7 @@
; RUN: llc < %s -march=x86 -relocation-model=static | FileCheck %s
; RUN: llc < %s -march=x86 -mcpu=corei7 -relocation-model=static | FileCheck %s
; CHECK: align
; CHECK: movl $4, -4(%ecx)
; CHECK: movl $5, (%ecx)
; CHECK: movlpd %xmm0, -4(%ecx)
; CHECK: addl $4, %ecx
; CHECK: decl %eax
; CHECK: jne