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5 Commits

Author SHA1 Message Date
Benjamin Kramer
5d9e616519 DAGCombiner: Don't drop extension behavior when shrinking a load when unsafe. 
ReduceLoadWidth unconditionally drops extensions from loads. Limit it to the
case when all of the bits the extension would otherwise produce are dropped by
the shrink. It would be possible to shrink the load in more cases by merging
the extensions, but this isn't trivial and a very rare case. I left a TODO for
that case.

Fixes PR16551.

llvm-svn: 185755
 2013-07-06 14:05:09 +00:00
Benjamin Kramer
5872fe13c9 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
d971be891d 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
6efe7518bf test/CodeGen/X86/shrink-compare.ll: Relax expressions for Win64. 
llvm-svn: 130039
 2011-04-23 00:15:45 +00:00
Benjamin Kramer
f6eab5f86e 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