diff options
| -rw-r--r-- | lib/Target/X86/README.txt | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/lib/Target/X86/README.txt b/lib/Target/X86/README.txt index 590a6dbeba..3e40027e9b 100644 --- a/lib/Target/X86/README.txt +++ b/lib/Target/X86/README.txt @@ -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"))). |