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LLVM backend for 6502
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Chandler Carruth 3b7b209bf8 Fix a devilish miscompile exposed by block placement. The 
updateTerminator code didn't correctly handle EH terminators in one very
specific case. AnalyzeBranch would find no terminator instruction, and
so the fallback in updateTerminator is to assume fallthrough. This is
correct, but the destination of the fallthrough was assumed to be the
first successor.

This is *almost always* true, but in certain cases the loop
transformations will cause the landing pad to be the first successor!
Instead of this brittle logic, actually look through the successors for
a non-landing-pad accessor, and to assert if more than one is found.

This will hopefully fix some (if not all) of the self host miscompiles
with block placement. Thanks to Benjamin Kramer for reporting, Nick
Lewycky for an initial stab at a reduction, and Duncan for endless
advice on EH (which I know nothing about) as well as reviewing the
actual fix.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145062 91177308-0d34-0410-b5e6-96231b3b80d8
2011-11-22 13:13:16 +00:00
autoconf Add configure checking for pread(2) and use it to save a syscall when reading files. 2011-11-22 12:31:53 +00:00
bindings Minor fixes in Makefiles for the OCaml bindings: 2011-11-09 12:00:39 +00:00
cmake Add configure checking for pread(2) and use it to save a syscall when reading files. 2011-11-22 12:31:53 +00:00
docs x86/windows issues fixed. 2011-11-17 01:42:23 +00:00
examples build: Add initial cut at LLVMBuild.txt files. 2011-11-03 18:53:17 +00:00
include Add configure checking for pread(2) and use it to save a syscall when reading files. 2011-11-22 12:31:53 +00:00
lib Fix a devilish miscompile exposed by block placement. The 2011-11-22 13:13:16 +00:00
projects build: Add initial cut at LLVMBuild.txt files. 2011-11-03 18:53:17 +00:00
runtime PathProfiling.c: Get rid of using "inline". We may expect compiler shall optimize out "static" scope w/o "inline". 2011-11-08 12:03:14 +00:00
test Fix a devilish miscompile exposed by block placement. The 2011-11-22 13:13:16 +00:00
tools Sink codegen optimization level into MCCodeGenInfo along side relocation model 2011-11-16 08:38:26 +00:00
unittests Fix Windows build, don't try to #include <pthread.h> when we know it's not 2011-11-14 22:10:23 +00:00
utils Remove some unnecessary filtering checks from X86 disassembler table build. 2011-11-19 05:48:20 +00:00
.gitignore git: Add tools/lldb to the ignore list. 2011-11-10 22:55:50 +00:00
CMakeLists.txt Revert r144300 "llvm-config: Replace with C++ version (was llvm-config-2).", 2011-11-10 19:59:35 +00:00
configure Add configure checking for pread(2) and use it to save a syscall when reading files. 2011-11-22 12:31:53 +00:00
CREDITS.TXT CREDITS.TXT: Add a line. (test commit) 2011-10-29 23:42:14 +00:00
LICENSE.TXT Happy new year. 2011-06-12 15:26:54 +00:00
llvm.spec.in
LLVMBuild.txt build: Add initial cut at LLVMBuild.txt files. 2011-11-03 18:53:17 +00:00
Makefile build/Make: Define a TARGET_NATIVE_ARCH variable to be a bit more precise than 2011-11-12 00:18:02 +00:00
Makefile.common
Makefile.config.in build/Make: Define a TARGET_NATIVE_ARCH variable to be a bit more precise than 2011-11-12 00:18:02 +00:00
Makefile.rules build/Make: Switch over to using llvm-config-2 for dependencies one more (hopefully last) time, now that it also builds as a build tool. 2011-11-14 17:17:45 +00:00
README.txt test commit undo 2011-11-10 20:39:51 +00:00

README.txt 

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

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