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LLVM backend for 6502
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ca0a4778a8
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Chris Lattner ca0a4778a8 Minor tweak to the branch selector. When emitting a two-way branch, and if 
we're in a single-mbb loop, make sure to emit the backwards branch as the
conditional branch instead of the uncond branch.  For example, emit this:

LBBl29_z__44:
        stw r9, 0(r15)
        stw r9, 4(r15)
        stw r9, 8(r15)
        stw r9, 12(r15)
        addi r15, r15, 16
        addi r8, r8, 1
        cmpw cr0, r8, r28
        ble cr0, LBBl29_z__44
        b LBBl29_z__48                   *** NOT PART OF LOOP

Instead of:

LBBl29_z__44:
        stw r9, 0(r15)
        stw r9, 4(r15)
        stw r9, 8(r15)
        stw r9, 12(r15)
        addi r15, r15, 16
        addi r8, r8, 1
        cmpw cr0, r8, r28
        bgt cr0, LBBl29_z__48            *** PART OF LOOP!
        b LBBl29_z__44

The former sequence has one fewer dispatch group for the loop body.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23582 91177308-0d34-0410-b5e6-96231b3b80d8
2005-10-01 23:06:26 +00:00
autoconf For PR619: 2005-08-24 10:43:10 +00:00
docs Update the discussion of TargetRegisterDesc 2005-09-30 17:46:55 +00:00
examples For PR616: 2005-08-24 10:07:20 +00:00
include/llvm Annotate nodes with their addresses if a graph requests it. 2005-10-01 00:19:21 +00:00
lib Minor tweak to the branch selector. When emitting a two-way branch, and if 2005-10-01 23:06:26 +00:00
projects Implement PR614: 2005-08-27 18:50:39 +00:00
runtime
test more specific tests of subtarget stuff 2005-09-30 20:30:24 +00:00
tools Speed up isBytecodeLPath from 20s to .01s in common cases. This makes -native 2005-09-23 06:11:24 +00:00
utils Rename MRegisterDesc -> TargetRegisterDesc for consistency 2005-09-30 17:49:27 +00:00
win32 Fix VC++ build errors. 2005-09-25 19:04:43 +00:00
Xcode Added targets to speed up build of llc. 2005-09-09 17:50:20 +00:00
.cvsignore Ignore the configure.out file generated by "make reconfigure" 2005-06-18 23:01:25 +00:00
configure For PR616: 2005-08-24 10:07:20 +00:00
CREDITS.TXT Add a note, people are responsible for requesting that they be added to the 2005-08-02 22:10:21 +00:00
LICENSE.TXT Remove extraneous colons after program names for consistency 2005-05-12 21:39:01 +00:00
llvm.spec Onward to LLVM-1.6 and beyond! 2005-05-18 20:23:20 +00:00
llvm.spec.in Onward to LLVM-1.6 and beyond! 2005-05-18 20:23:20 +00:00
Makefile For PR614: 2005-08-25 04:59:49 +00:00
Makefile.common
Makefile.config.in Two changes: 2005-04-22 17:14:14 +00:00
Makefile.rules allow for a target to ask for a dag isel 2005-09-03 01:15:25 +00:00
README.txt

README.txt 

Low Level Virtual Machine (LLVM)
================================

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