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| author | Nadav Rotem <nrotem@apple.com> | 2012-09-29 06:33:25 +0000 |
|---|---|---|
| committer | Nadav Rotem <nrotem@apple.com> | 2012-09-29 06:33:25 +0000 |
| commit | 72f7b0811efef58080a909abbc14d74c40c0867d (patch) | |
| tree | b6382d9eb88191bc00bb83d3db24d7030fc0b9c2 /test/CodeGen/X86/loop-strength-reduce-2.ll | |
| parent | aa64c182805702c3d3e5d414adaee10b39e9eef5 (diff) | |
A DAGCombine optimization for merging consecutive stores. This optimization is not profitable in many cases
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@164885 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/X86/loop-strength-reduce-2.ll')
| -rw-r--r-- | test/CodeGen/X86/loop-strength-reduce-2.ll | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/test/CodeGen/X86/loop-strength-reduce-2.ll b/test/CodeGen/X86/loop-strength-reduce-2.ll index b546462b68..b094fed2f6 100644 --- a/test/CodeGen/X86/loop-strength-reduce-2.ll +++ b/test/CodeGen/X86/loop-strength-reduce-2.ll @@ -1,20 +1,18 @@ -; RUN: llc < %s -march=x86 -relocation-model=pic | FileCheck %s -check-prefix=PIC -; RUN: llc < %s -march=x86 -relocation-model=static | FileCheck %s -check-prefix=STATIC +; RUN: llc < %s -march=x86 -mcpu=corei7 -relocation-model=pic | FileCheck %s -check-prefix=PIC +; RUN: llc < %s -march=x86 -mcpu=corei7 -relocation-model=static | FileCheck %s -check-prefix=STATIC ; ; Make sure the common loop invariant A is hoisted up to preheader, ; since too many registers are needed to subsume it into the addressing modes. ; It's safe to sink A in when it's not pic. ; PIC: align -; PIC: movl $4, -4([[REG:%e[a-z]+]]) -; PIC: movl $5, ([[REG]]) +; PIC: movlpd %xmm0, -4([[REG:%e[a-z]+]]) ; PIC: addl $4, [[REG]] ; PIC: decl {{%e[[a-z]+}} ; PIC: jne ; STATIC: align -; STATIC: movl $4, -4(%ecx) -; STATIC: movl $5, (%ecx) +; STATIC: movlpd %xmm0, -4(%ecx) ; STATIC: addl $4, %ecx ; STATIC: decl %eax ; STATIC: jne |