Chris Lattner beac75da37 implement rdar://6653118 - fastisel should fold loads where possible. ... Since mem2reg isn't run at -O0, we get a ton of reloads from the stack, for example, before, this code: int foo(int x, int y, int z) { return x+y+z; } used to compile into: _foo: ## @foo subq $12, %rsp movl %edi, 8(%rsp) movl %esi, 4(%rsp) movl %edx, (%rsp) movl 8(%rsp), %edx movl 4(%rsp), %esi addl %edx, %esi movl (%rsp), %edx addl %esi, %edx movl %edx, %eax addq $12, %rsp ret Now we produce: _foo: ## @foo subq $12, %rsp movl %edi, 8(%rsp) movl %esi, 4(%rsp) movl %edx, (%rsp) movl 8(%rsp), %edx addl 4(%rsp), %edx ## Folded load addl (%rsp), %edx ## Folded load movl %edx, %eax addq $12, %rsp ret Fewer instructions and less register use = faster compiles. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113102 91177308-0d34-0410-b5e6-96231b3b80d8		2010-09-05 02:18:34 +00:00
..
Alpha	PR7774: Fix undefined shifts in Alpha backend. As a bonus, this actually	2010-08-01 21:13:28 +00:00
ARM	Replace NEON vabdl, vaba, and vabal intrinsics with combinations of the	2010-09-03 01:35:08 +00:00
Blackfin	Remove TargetInstrInfo::copyRegToReg entirely.	2010-07-11 17:01:17 +00:00
CBackend
CellSPU	Fix lowering of INSERT_VECTOR_ELT in SPU.	2010-08-29 12:41:50 +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	Fix a crash in the dag combiner caused by ConstantFoldBIT_CONVERTofBUILD_VECTOR calling itself	2010-07-27 18:02:18 +00:00
MBlaze	Split big test into multiple directories to cater to	2010-04-07 20:43:35 +00:00
Mips	Correct bogus module triple specifications.	2010-08-30 10:48:29 +00:00
MSP430	Insert ANY_EXTEND node instead of invalid truncate during DAG Combining (X & 1),	2010-05-01 12:52:34 +00:00
PIC16	Remove XFAIL for vg_leak as the leaks are fixed by 100601.	2010-04-07 07:06:48 +00:00
PowerPC	PR7781: Fix incorrect shifting in PPCTargetLowering::LowerBUILD_VECTOR.	2010-08-02 00:18:19 +00:00
SPARC	Split big test into multiple directories to cater to	2010-04-07 20:43:35 +00:00
SystemZ	Correct bogus module triple specifications.	2010-08-30 10:48:29 +00:00
Thumb	Re-apply r112883:	2010-09-03 18:37:12 +00:00
Thumb2	Re-apply r112883:	2010-09-03 18:37:12 +00:00
X86	implement rdar://6653118 - fastisel should fold loads where possible.	2010-09-05 02:18:34 +00:00
XCore	Start function numbering at 0.	2010-04-17 16:29:15 +00:00