Benjamin Kramer
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d724a590e5
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X86: Add a bunch of peeps for add and sub of SETB.
"b + ((a < b) ? 1 : 0)" compiles into
cmpl %esi, %edi
adcl $0, %esi
instead of
cmpl %esi, %edi
sbbl %eax, %eax
andl $1, %eax
addl %esi, %eax
This saves a register, a false dependency on %eax
(Intel's CPUs still don't ignore it) and it's shorter.
llvm-svn: 131070
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2011-05-08 18:36:07 +00:00 |