7 Commits

Author	SHA1	Message	Date
Chris Lattner	684ae57b8e	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. llvm-svn: 113102	2010-09-05 02:18:34 +00:00
Dan Gohman	df2896d609	Eliminate more uses of llvm-as and llvm-dis. ... llvm-svn: 81290	2009-09-08 23:54:48 +00:00
Dan Gohman	f66b3277d3	Refactor X86SelectConstAddr, folding it into X86SelectAddress. This ... results in better code for globals. Also, unbreak the local CSE for GlobalValue stub loads. llvm-svn: 56371	2008-09-19 22:16:54 +00:00
Evan Cheng	dc011a1b10	Fix a constant lowering bug. Now we can do load and store instructions with funky getelementptr embedded in the address operand. ... llvm-svn: 55975	2008-09-09 01:26:59 +00:00
Owen Anderson	cd3ee9198d	Fix the ordering of operands to the store (inverted relative to LLVM IR), and fix the testcase. ... llvm-svn: 55777	2008-09-04 16:48:33 +00:00
Owen Anderson	35485dbae3	Add a first attempt at implementing stores for X86 fast isel using target hooks. ... Dan or Evan, please review. llvm-svn: 55764	2008-09-04 07:08:58 +00:00
Evan Cheng	9c728a557d	Load from GV stub should be locally CSE'd. ... llvm-svn: 55763	2008-09-04 06:18:33 +00:00