llvm-project

Commit Graph

Author	SHA1	Message	Date
Evan Cheng	ea5c6be766	Run codegen dce pass for all targets at all optimization levels. Previously it's only run for x86 with fastisel. I've found it being very effective in eliminating some obvious dead code as result of formal parameter lowering especially when tail call optimization eliminated the need for some of the loads from fixed frame objects. It also shrinks a number of the tests. A couple of tests no longer make sense and are now eliminated. llvm-svn: 95493	2010-02-06 09:07:11 +00:00
Evan Cheng	74a3231de4	Follow up to 81494. When the folded reload is narrowed to a 32-bit load then change the destination register to a 32-bit one or add a sub-register index. llvm-svn: 81496	2009-09-11 01:01:31 +00:00
Evan Cheng	3cad6283b8	It's not legal to fold a load from a narrower stack slot into a wider instruction. If done, the instruction does a 64-bit load and that's not safe. This can happen we a subreg_to_reg 0 has been coalesced. One exception is when the instruction that folds the load is a move, then we can simply turn it into a 32-bit load from the stack slot. rdar://7170444 llvm-svn: 81494	2009-09-11 00:39:26 +00:00

Author

SHA1

Message

Date

Evan Cheng

ea5c6be766

Run codegen dce pass for all targets at all optimization levels. Previously it's

only run for x86 with fastisel. I've found it being very effective in
eliminating some obvious dead code as result of formal parameter lowering
especially when tail call optimization eliminated the need for some of the loads
from fixed frame objects. It also shrinks a number of the tests. A couple of
tests no longer make sense and are now eliminated.

llvm-svn: 95493

2010-02-06 09:07:11 +00:00

Evan Cheng

74a3231de4

Follow up to 81494. When the folded reload is narrowed to a 32-bit load then change the destination register to a 32-bit one or add a sub-register index.

llvm-svn: 81496

2009-09-11 01:01:31 +00:00

Evan Cheng

3cad6283b8

It's not legal to fold a load from a narrower stack slot into a wider instruction. If done, the instruction does a 64-bit load and that's not

safe. This can happen we a subreg_to_reg 0 has been coalesced. One
exception is when the instruction that folds the load is a move, then we
can simply turn it into a 32-bit load from the stack slot.                                                                                                                    

rdar://7170444

llvm-svn: 81494

2009-09-11 00:39:26 +00:00

3 Commits