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4 Commits

Author SHA1 Message Date
Chris Lattner
04ef853e23 Fix a bug in ReduceLoadWidth that wasn't handling extending 
loads properly.  We miscompiled the testcase into:

_test:                                  ## @test
	movl	$128, (%rdi)
	movzbl	1(%rdi), %eax
	ret

Now we get a proper:

_test:                                  ## @test
	movl	$128, (%rdi)
	movsbl	(%rdi), %eax
	movzbl	%ah, %eax
	ret

This fixes PR8757.

llvm-svn: 122392
 2010-12-22 08:02:57 +00:00
Dan Gohman
903935bf3e Fix DAGCombiner to avoid folding a sext-in-reg or similar through a shl 
in order to fold it into a load.

llvm-svn: 118471
 2010-11-09 01:54:35 +00:00
Dan Gohman
f78cd9006b Delete an extraneous svn:executable property. 
llvm-svn: 118470
 2010-11-09 01:51:06 +00:00
Dan Gohman
8071a75d31 Fix DAGCombiner to avoid going into an infinite loop when it 
encounters (and:i64 (shl:i64 (load:i64), 1), 0xffffffff).
This fixes rdar://8606584.

llvm-svn: 118143
 2010-11-03 01:47:46 +00:00