Bill Wendling 37b52ee6d9 Micro-optimization: ... This code: float floatingPointComparison(float x, float y) { double product = (double)x * y; if (product == 0.0) return product; return product - 1.0; } produces this: _floatingPointComparison: 0000000000000000 cvtss2sd %xmm1,%xmm1 0000000000000004 cvtss2sd %xmm0,%xmm0 0000000000000008 mulsd %xmm1,%xmm0 000000000000000c pxor %xmm1,%xmm1 0000000000000010 ucomisd %xmm1,%xmm0 0000000000000014 jne 0x00000004 0000000000000016 jp 0x00000002 0000000000000018 jmp 0x00000008 000000000000001a addsd 0x00000006(%rip),%xmm0 0000000000000022 cvtsd2ss %xmm0,%xmm0 0000000000000026 ret The "jne/jp/jmp" sequence can be reduced to this instead: _floatingPointComparison: 0000000000000000 cvtss2sd %xmm1,%xmm1 0000000000000004 cvtss2sd %xmm0,%xmm0 0000000000000008 mulsd %xmm1,%xmm0 000000000000000c pxor %xmm1,%xmm1 0000000000000010 ucomisd %xmm1,%xmm0 0000000000000014 jp 0x00000002 0000000000000016 je 0x00000008 0000000000000018 addsd 0x00000006(%rip),%xmm0 0000000000000020 cvtsd2ss %xmm0,%xmm0 0000000000000024 ret for a savings of 2 bytes. This xform can happen when we recognize that jne and jp jump to the same "true" MBB, the unconditional jump would jump to the "false" MBB, and the "true" branch is the fall-through MBB. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97766 91177308-0d34-0410-b5e6-96231b3b80d8		2010-03-05 00:24:26 +00:00
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Alpha	Fix PR2590 by making PatternSortingPredicate actually be	2010-03-01 22:09:11 +00:00
ARM	pr6478: The frame pointer spill frame index is only defined when there is a	2010-03-04 21:42:36 +00:00
Blackfin	Change the scheduler from adding nodes in allnodes order	2010-02-24 06:11:37 +00:00
CBackend	Eliminate more uses of llvm-as and llvm-dis.	2009-09-09 00:09:15 +00:00
CellSPU	don't let asm-verbose break the check-next lines in these tests.	2010-01-19 06:39:54 +00:00
CPP	fix PR5295 where the .ll parser didn't reject a function after a global	2009-10-25 23:22:50 +00:00
Generic	stop using anders-aa	2010-03-01 20:24:05 +00:00
MBlaze	Adding the MicroBlaze backend.	2010-02-23 19:15:24 +00:00
Mips	Delete useless trailing semicolons.	2010-01-05 17:55:26 +00:00
MSP430	Fix some issues in WalkChainUsers dealing with	2010-03-02 22:20:06 +00:00
PIC16	this testcase is failing because pic16 doesn't define a reg/reg	2010-03-02 20:48:24 +00:00
PowerPC	add some random nounwinds.	2010-02-28 20:36:49 +00:00
SPARC	add support for the sparcv9-*-* target triple to turn on	2010-02-04 06:34:01 +00:00
SystemZ	Teach dag combine to fold the following transformation more aggressively:	2010-01-06 19:38:29 +00:00
Thumb	Run the pre-register allocation tail duplication pass by default. Remove	2010-01-16 00:29:50 +00:00
Thumb2	Drop the ".w" qualifier for t2UXTB16* instructions as there is no 16-bit version	2010-03-04 22:24:41 +00:00
X86	Micro-optimization:	2010-03-05 00:24:26 +00:00
XCore	Fix XCoreTargetLowering::isLegalAddressingMode() to handle VoidTy.	2010-02-26 16:44:51 +00:00