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4 Commits

Author SHA1 Message Date
Benjamin Kramer 8aaf197990 DAGCombine: Avoid an edge case where it tried to create an i0 type for (x & 0) == 0. 
Fixes PR16083.

llvm-svn: 182357
 2013-05-21 08:51:09 +00:00
Benjamin Kramer fc88c3761f DAGCombine: Also shrink eq compares where the constant is exactly as large as the smaller type. 
if ((x & 255) == 255)

before: movzbl  %al, %eax
        cmpl  $255, %eax

after:  cmpb  $-1, %al
llvm-svn: 182038
 2013-05-16 18:47:58 +00:00
NAKAMURA Takumi 576273cf56 test/CodeGen/X86/shrink-compare.ll: Relax expressions for Win64. 
llvm-svn: 130039
 2011-04-23 00:15:45 +00:00
Benjamin Kramer 341c11da3b DAGCombine: fold "(zext x) == C" into "x == (trunc C)" if the trunc is lossless. 
On x86 this allows to fold a load into the cmp, greatly reducing register pressure.
  movzbl	(%rdi), %eax
  cmpl	$47, %eax
->
  cmpb	$47, (%rdi)

This shaves 8k off gcc.o on i386. I'll leave applying the patch in README.txt to Chris :)

llvm-svn: 130005
 2011-04-22 18:47:44 +00:00