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
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Alpha
ARM	Replace NEON vabdl, vaba, and vabal intrinsics with combinations of the	2010-09-03 01:35:08 +00:00
Blackfin
CBackend
CellSPU	Fix lowering of INSERT_VECTOR_ELT in SPU.	2010-08-29 12:41:50 +00:00
CPP
Generic
MBlaze
Mips	Correct bogus module triple specifications.	2010-08-30 10:48:29 +00:00
MSP430
PIC16
PowerPC
SPARC
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