Benjamin Kramer 0baa94a13b InstCombine: Turn icmp + sext into bitwise/integer ops when the input has only one unknown bit. ...

int test1(unsigned x) { return (x&8) ? 0 : -1; }
int test3(unsigned x) { return (x&8) ? -1 : 0; }

before (x86_64):
_test1:
	andl	$8, %edi
	cmpl	$1, %edi
	sbbl	%eax, %eax
	ret
_test3:
	andl	$8, %edi
	cmpl	$1, %edi
	sbbl	%eax, %eax
	notl	%eax
	ret

after:
_test1:
	shrl	$3, %edi
	andl	$1, %edi
	leal	-1(%rdi), %eax
	ret
_test3:
	shll	$28, %edi
	movl	%edi, %eax
	sarl	$31, %eax
	ret

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128732 91177308-0d34-0410-b5e6-96231b3b80d8

2011-04-01 20:09:10 +00:00

..

Hello

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InstCombine

InstCombine: Turn icmp + sext into bitwise/integer ops when the input has only one unknown bit.

2011-04-01 20:09:10 +00:00

Instrumentation

Remove PHINode::reserveOperandSpace(). Instead, add a parameter to

2011-03-30 11:28:46 +00:00

IPO

Remove PHINode::reserveOperandSpace(). Instead, add a parameter to

2011-03-30 11:28:46 +00:00

Scalar

* The DSE code that tested for overlapping needed to take into account the fact

2011-03-30 21:37:19 +00:00

Utils

Remove PHINode::reserveOperandSpace(). Instead, add a parameter to

2011-03-30 11:28:46 +00:00

CMakeLists.txt

Move library stuff out of the toplevel CMakeLists.txt file.

2011-02-18 22:06:14 +00:00

Makefile

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