| commit | 884c70c912b699a4d14d05dcac1ac4f2d47c0f9a | [log] [tgz] |
|---|---|---|
| author | Evan Cheng <evan.cheng@apple.com> | Thu Nov 27 00:49:46 2008 +0000 |
| committer | Evan Cheng <evan.cheng@apple.com> | Thu Nov 27 00:49:46 2008 +0000 |
| tree | eea845867e8c466b91a3bf184a9c9c1df7049e2e | |
| parent | 56eca9103ecbf2293842bfd6067ac26629221eaf [diff] |
On x86 favors folding short immediate into some arithmetic operations (e.g. add, and, xor, etc.) because materializing an immediate in a register is expensive in turns of code size. e.g. movl 4(%esp), %eax addl $4, %eax is 2 bytes shorter than movl $4, %eax addl 4(%esp), %eax git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60139 91177308-0d34-0410-b5e6-96231b3b80d8