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| author | Bill Wendling <isanbard@gmail.com> | 2009-10-27 22:40:45 +0000 |
|---|---|---|
| committer | Bill Wendling <isanbard@gmail.com> | 2009-10-27 22:40:45 +0000 |
| commit | d8499c9b7fae7c5afbb81dc7e7cf957abbafdb54 (patch) | |
| tree | 83c41cde2d84f49d18135709c527f56b7a1eff3b /lib/Target/X86/README.txt | |
| parent | 18fec73e29d68b9c7473720507f51de39b0873b1 (diff) | |
| download | external_llvm-d8499c9b7fae7c5afbb81dc7e7cf957abbafdb54.zip external_llvm-d8499c9b7fae7c5afbb81dc7e7cf957abbafdb54.tar.gz external_llvm-d8499c9b7fae7c5afbb81dc7e7cf957abbafdb54.tar.bz2 | |
Modify note.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85331 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/X86/README.txt')
| -rw-r--r-- | lib/Target/X86/README.txt | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/lib/Target/X86/README.txt b/lib/Target/X86/README.txt index 5967fd5..75dde2d 100644 --- a/lib/Target/X86/README.txt +++ b/lib/Target/X86/README.txt @@ -1969,9 +1969,17 @@ LBB1_2: movsbl %al, %eax Better: + movl %esi, %eax orl $-128, %eax andl $-128, %esi testb %dil, %dil cmovns %esi, %eax movsbl %al,%eax + +Best (recognize this as 'b = (b & ~0x80) | (a & 0x80)'): + + andb $-128, %dil + andb $127, %sil + orb %dil, %sil + movsbl %sil, %eax |