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Commit Graph

Author	SHA1	Message	Date
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	268cfea6bc	Fun x86 encoding tricks: when adding an immediate value of 128, use a SUB instruction instead of an ADD, because -128 can be encoded in an 8-bit signed immediate field, while +128 can't be. This avoids the need for a 32-bit immediate field in this case. A similar optimization applies to 64-bit adds with 0x80000000, with the 32-bit signed immediate field. To support this, teach tablegen how to handle 64-bit constants. llvm-svn: 57663	2008-10-17 01:33:43 +00:00

Author

SHA1

Message

Date

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

268cfea6bc

Fun x86 encoding tricks: when adding an immediate value of 128,

use a SUB instruction instead of an ADD, because -128 can be
encoded in an 8-bit signed immediate field, while +128 can't be.
This avoids the need for a 32-bit immediate field in this case.

A similar optimization applies to 64-bit adds with 0x80000000,
with the 32-bit signed immediate field.

To support this, teach tablegen how to handle 64-bit constants.

llvm-svn: 57663

2008-10-17 01:33:43 +00:00

2 Commits