Chris Lattner 50ad7c3f54 fold comparisons of gep'd alloca points with null to false, ...

implementing PR12013.  We now compile the testcase to:

__Z4testv:                              ## @_Z4testv
## BB#0:                                ## %_ZN4llvm15SmallVectorImplIiE9push_backERKi.exit
	pushq	%rbx
	subq	$64, %rsp
	leaq	32(%rsp), %rbx
	movq	%rbx, (%rsp)
	leaq	64(%rsp), %rax
	movq	%rax, 16(%rsp)
	movl	$1, 32(%rsp)
	leaq	36(%rsp), %rax
	movq	%rax, 8(%rsp)
	leaq	(%rsp), %rdi
	callq	__Z1gRN4llvm11SmallVectorIiLj8EEE
	movq	(%rsp), %rdi
	cmpq	%rbx, %rdi
	je	LBB0_2
## BB#1:
	callq	_free
LBB0_2:                                 ## %_ZN4llvm11SmallVectorIiLj8EED1Ev.exit
	addq	$64, %rsp
	popq	%rbx
	ret

instead of:

__Z4testv:                              ## @_Z4testv
## BB#0:
	pushq	%rbx
	subq	$64, %rsp
	xorl	%eax, %eax
	leaq	(%rsp), %rbx
	addq	$32, %rbx
	movq	%rbx, (%rsp)
	movq	%rbx, 8(%rsp)
	leaq	64(%rsp), %rcx
	movq	%rcx, 16(%rsp)
	je	LBB0_2
## BB#1:
	movl	$1, 32(%rsp)
	movq	%rbx, %rax
LBB0_2:                                 ## %_ZN4llvm15SmallVectorImplIiE9push_backERKi.exit
	addq	$4, %rax
	movq	%rax, 8(%rsp)
	leaq	(%rsp), %rdi
	callq	__Z1gRN4llvm11SmallVectorIiLj8EEE
	movq	(%rsp), %rdi
	cmpq	%rbx, %rdi
	je	LBB0_4
## BB#3:
	callq	_free
LBB0_4:                                 ## %_ZN4llvm11SmallVectorIiLj8EED1Ev.exit
	addq	$64, %rsp
	popq	%rbx
	ret

This doesn't shrink clang noticably though.

llvm-svn: 150944

2012-02-20 00:42:49 +00:00

..

2010-12-20-Boolean.ll

Rename this test.

2011-01-14 14:16:33 +00:00

2010-12-20-Distribute.ll

Simplify (X<<1)-X into X. According to my auto-simplier this is the most common missed

2011-01-18 09:24:58 +00:00

2011-01-14-Thread.ll

Factorize common code out of the InstructionSimplify shift logic. Add in

2011-01-14 14:44:12 +00:00

2011-02-01-Vector.ll

Have m_One also match constant vectors for which every element is 1.

2011-02-01 08:39:12 +00:00

2011-09-05-InsertExtractValue.ll

InstSimplify: Don't try to replace an extractvalue/insertvalue pair with the original value if types don't match.

2011-09-05 18:16:19 +00:00

2011-10-27-BinOpCrash.ll

Reapply commit 143028 with a fix: the problem was casting a ConstantExpr Mul

2011-10-27 19:16:21 +00:00

2011-11-23-MaskedBitsCrash.ll

Fix a crash in which a multiplication was being reported as being both negative

2011-11-23 16:26:47 +00:00

AndOrXor.ll

A shift of a power of two is a power of two or zero.

2011-10-28 18:30:05 +00:00

compare.ll

fold comparisons of gep'd alloca points with null to false,

2012-02-20 00:42:49 +00:00

exact-nsw-nuw.ll

Teach instsimplify some tricks about exact/nuw/nsw shifts.

2011-02-09 17:15:04 +00:00

fdiv.ll

Move InstCombine's knowledge of fdiv to SimplifyInstruction().

2011-01-29 15:26:31 +00:00

lit.local.cfg

Replace all instances of dg.exp file with lit.local.cfg, since all tests are run with LIT now and now Dejagnu. dg.exp is no longer needed.

2012-02-16 06:28:33 +00:00

maxmin.ll

The comparision "max(x,y)==x" is equivalent to "x>=y". Since the max is

2011-05-07 16:56:49 +00:00

reassociate.ll

teach instsimplify to transform (X / Y) * Y to X

2011-02-06 22:05:31 +00:00

rem.ll

Move some rem transforms out of instcombine and into instsimplify.

2011-05-02 16:27:02 +00:00

undef.ll

Add tests for existing InstSimplify features.

2011-11-04 18:39:16 +00:00

vector_gep.ll

Add support for vectors of pointers.

2011-12-05 06:29:09 +00:00