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3 Commits

Author SHA1 Message Date
Jim Grosbach
02f7297367 X86: Perform integer comparisons at i32 or larger. 
Utilizing the 8 and 16 bit comparison instructions, even when an input can
be folded into the comparison instruction itself, is typically not worth it.
There are too many partial register stalls as a result, leading to significant
slowdowns. By always performing comparisons on at least 32-bit
registers, performance of the calculation chain leading to the
comparison improves. Continue to use the smaller comparisons when
minimizing size, as that allows better folding of loads into the
comparison instructions.

rdar://15386341

llvm-svn: 195496
 2013-11-22 19:57:47 +00:00
NAKAMURA Takumi
101efee740 Relax expressions and add explicit triplets -linux and -win32. 
llvm-svn: 126198
 2011-02-22 07:19:28 +00:00
Dan Gohman
ef1f246d88 Move zext and sext casts fed by loads into the same block as the 
load, to help SelectionDAG fold them into the loads, unless
conditions are unfavorable.

llvm-svn: 84271
 2009-10-16 20:59:35 +00:00