llvm/lib at c653de6c0f3722154a41cbb57c213a0cdd789419 - llvm

RPCSX/llvm

mirror of https://github.com/RPCSX/llvm.git synced 2025-01-22 04:05:05 +00:00

History

Nadav Rotem c653de6c0f A DAGCombine optimization for mergeing consecutive stores to memory. The optimization

is not profitable in many cases because modern processors perform multiple stores
in parallel and merging stores prior to merging requires extra work. We handle two main cases:

1. Store of multiple consecutive constants:
  q->a = 3;
  q->4 = 5;
In this case we store a single legal wide integer.

2. Store of multiple consecutive loads:
  int a = p->a;
  int b = p->b;
  q->a = a;
  q->b = b;
In this case we load/store either ilegal vector registers or legal wide integer registers.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165125 91177308-0d34-0410-b5e6-96231b3b80d8

2012-10-03 16:11:15 +00:00

Analysis

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