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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28683 91177308-0d34-0410-b5e6-96231b3b80d8
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Evan Cheng 2006-06-04 09:08:00 +00:00
parent f8614db52e
commit c21051ff96
1 changed files with 19 additions and 0 deletions
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19
lib/Target/X86/README.txt
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@ -538,6 +538,9 @@ _foo:
sarl $24, %eax
ret
SIGN_EXTEND_INREG can be implemented as (sext (trunc)) to take advantage of
sub-registers.
//===---------------------------------------------------------------------===//
Consider this:
@ -649,3 +652,19 @@ estimate to determine whether the match is profitable.
However, if we care more about code size, then imull is better. It's two bytes
shorter than movl + leal.
//===---------------------------------------------------------------------===//
Implement CTTZ, CTLZ with bsf and bsr.
//===---------------------------------------------------------------------===//
It appears gcc place string data with linkonce linkage in
.section __TEXT,__const_coal,coalesced instead of
.section __DATA,__const_coal,coalesced.
Take a look at darwin.h, there are other Darwin assembler directives that we
do not make use of.
//===---------------------------------------------------------------------===//
We should handle __attribute__ ((__visibility__ ("hidden"))).