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LLVM backend for 6502
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8f832fce3b
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Oliver Stannard 8f832fce3b [Thumb1] Re-write emitThumbRegPlusImmediate 
This was motivated by a bug which caused code like this to be
miscompiled:
  declare void @take_ptr(i8*)
  define void @test() {
    %addr1.32 = alloca i8
    %addr2.32 = alloca i32, i32 1028
    call void @take_ptr(i8* %addr1)
    ret void
  }

This was emitting the following assembly to get the value of %addr1:
  add r0, sp, #1020
  add r0, r0, #8
However, "add r0, r0, #8" is not a valid Thumb1 instruction, and this
could not be assembled. The generated object file contained this,
resulting in r0 holding SP+8 rather tha SP+1028:
  add r0, sp, #1020
  add r0, sp, #8

This function looked like it could have caused miscompilations for
other combinations of registers and offsets (though I don't think it is
currently called with these), and the heuristic it used did not match
the emitted code in all cases.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222125 91177308-0d34-0410-b5e6-96231b3b80d8
2014-11-17 11:18:10 +00:00
autoconf Add a check for misbehaving -Wcomment from gcc-4.7 and add 2014-11-05 00:35:15 +00:00
bindings [OCaml] Fix mismatched CAMLparam/CAMLreturn. 2014-11-03 11:47:14 +00:00
cmake Provide missing definition of uppercase_CMAKE_BUILD_TYPE in HandleLLVMOptions module 2014-11-15 07:45:31 +00:00
docs R600/SI: Start implementing an assembler 2014-11-14 14:08:00 +00:00
examples [CMake] llvm/examples: Update libdeps for unoptimized builds. 2014-10-31 15:27:16 +00:00
include [Thumb1] Re-write emitThumbRegPlusImmediate 2014-11-17 11:18:10 +00:00
lib [Thumb1] Re-write emitThumbRegPlusImmediate 2014-11-17 11:18:10 +00:00
projects [cmake] Use the external project machinery for libcxxabi so that it can 2014-07-25 10:27:40 +00:00
test [Thumb1] Re-write emitThumbRegPlusImmediate 2014-11-17 11:18:10 +00:00
tools Object, COFF: Tighten the object file parser 2014-11-17 11:17:17 +00:00
unittests Dispose disassembler after use in unit test. 2014-11-15 10:53:12 +00:00
utils Move register class name strings to a single array in MCRegisterInfo to reduce static table size and number of relocation entries. 2014-11-17 05:50:14 +00:00
.arcconfig Updated phabricator server. 2014-04-07 03:57:04 +00:00
.clang-format
.clang-tidy Enable display of compiler diagnostics in clang-tidy by default. 2014-10-29 17:29:38 +00:00
.gitignore Initial version of Go bindings. 2014-10-16 22:48:02 +00:00
CMakeLists.txt Pass PRIVATE to target_link_libraries if using shared libraries. 2014-11-07 15:33:56 +00:00
CODE_OWNERS.TXT Add Tom Stellard's role as 3.5 release manager. 2014-09-12 08:07:31 +00:00
configure Add a check for misbehaving -Wcomment from gcc-4.7 and add 2014-11-05 00:35:15 +00:00
CREDITS.TXT Rise from the dead and update personal info 2014-08-25 17:51:04 +00:00
LICENSE.TXT
llvm.spec.in
LLVMBuild.txt
Makefile
Makefile.common
Makefile.config.in Add a check for misbehaving -Wcomment from gcc-4.7 and add 2014-11-05 00:35:15 +00:00
Makefile.rules Add a check for misbehaving -Wcomment from gcc-4.7 and add 2014-11-05 00:35:15 +00:00
README.txt Trivial test commit. 2014-04-26 19:05:45 +00:00

README.txt 

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

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