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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26173 91177308-0d34-0410-b5e6-96231b3b80d8
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Evan Cheng 2006-02-14 08:25:32 +00:00
parent 87ed716d21
commit 952b7d6a1e
1 changed files with 17 additions and 0 deletions
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17
lib/Target/X86/README.txt
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@ -426,3 +426,20 @@ When: "movl $_dst, _ptr" is sufficient.
//===---------------------------------------------------------------------===//
Use fisttp to do FP to integer conversion whenever it is available.
//===---------------------------------------------------------------------===//
Instead of the following for memset char*, 1, 10:
movl $16843009, 4(%edx)
movl $16843009, (%edx)
movw $257, 8(%edx)
It might be better to generate
movl $16843009, %eax
movl %eax, 4(%edx)
movl %eax, (%edx)
movw al, 8(%edx)
when we can spare a register. It reduces code size.