hanchenye-llvm-project

Commit Graph

Author	SHA1	Message	Date
Dan Gohman	40503396da	Eliminate more uses of llvm-as and llvm-dis. llvm-svn: 81290	2009-09-08 23:54:48 +00:00
Dan Gohman	527ca7e253	Re-enable elimination of unnecessary SUBREG_TO_REG instructions in LowerSubregs, and fix an x86-64 isel bug that this exposed. SUBREG_TO_REG for x86-64 implicit zero extension is only safe for isel to generate when the source is known to always have zeros in the high 32 bits. The EXTRACT_SUBREG instruction does not clear the high 32 bits. llvm-svn: 54444	2008-08-07 02:54:50 +00:00

Author

SHA1

Message

Date

Dan Gohman

40503396da

Eliminate more uses of llvm-as and llvm-dis.

llvm-svn: 81290

2009-09-08 23:54:48 +00:00

Dan Gohman

527ca7e253

Re-enable elimination of unnecessary SUBREG_TO_REG instructions in

LowerSubregs, and fix an x86-64 isel bug that this exposed.

SUBREG_TO_REG for x86-64 implicit zero extension is only safe for
isel to generate when the source is known to always have zeros in
the high 32 bits. The EXTRACT_SUBREG instruction does not clear
the high 32 bits.

llvm-svn: 54444

2008-08-07 02:54:50 +00:00

2 Commits