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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74508 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-06-30 04:20:46 +00:00
parent 9cdd4f57c8
commit a05ec61684
1 changed files with 20 additions and 0 deletions
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20
lib/Target/X86/README.txt
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@ -1932,3 +1932,23 @@ Replacing an icmp+select with a shift should always be considered profitable in
instcombine.
//===---------------------------------------------------------------------===//
It looks like we don't have patterns (or they aren't matching) for adc with
immediate:
define i64 @f1(i64 %a) nounwind {
%tmp = sub i64 %a, 734439407618
ret i64 %tmp
}
$ llvm-as < t.ll | llc -march=x86
_f1:
movl 4(%esp), %eax
addl $4294967294, %eax
movl $4294967124, %edx
adcl 8(%esp), %edx
ret
There is no need to clobber %edx there.
//===---------------------------------------------------------------------===//