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LLVM backend for 6502
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Akira Hatanaka 0285e7d1c1 When constant double 0.0 is lowered, make sure 0 is copied directly from an 
integer register to a floating point register. It is not valid to interpret
the value of a floating pointer register as part of a double precision
floating point value after a single precision floating point computational
or move instruction stores its result to the register.

- In the test case, the following code is generated before this patch is
  applied:
mtc1  $zero, $f2    ; unformatted copy to $f2
mov.s $f0, $f2      ; $f0 is in single format
sdc1  $f12, 0($sp)
mov.s $f1, $f2      ; $f1 is in single format
c.eq.d  $f12, $f0   ; $f0 cannot be interpreted as double

- The following code is generated after this patch is applied:
mtc1  $zero, $f0    ; unformatted copy to $f0
mtc1  $zero, $f1    ; unformatted copy to $f1
c.eq.d  $f12, $f0   ; $f0 can be interpreted as double

Bhanu Chetlapalli and Chris Dearman at MIPS technologies reported this bug and
provided the test case.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137484 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-12 18:09:59 +00:00
autoconf Update the default bug report url in autoconf. 2011-08-02 20:53:43 +00:00
bindings Remove the build_unwind function from the OCaml bindings. 2011-08-10 01:10:17 +00:00
cmake CMake: Eliminate unused checks and #undef(s) as below; 2011-08-12 03:27:48 +00:00
docs add new accessors to reflect new terminology in struct types. 2011-08-12 17:31:02 +00:00
examples
include add ifdef's to let people easily remove these dead api for testing. 2011-08-12 18:08:19 +00:00
lib When constant double 0.0 is lowered, make sure 0 is copied directly from an 2011-08-12 18:09:59 +00:00
projects
runtime
test Tidy up formatting. 2011-08-12 17:43:31 +00:00
tools Fix bugpoint fallout from the new type system. 2011-08-12 17:25:45 +00:00
unittests Avoid undefined behaviour if somehow NUM_GRAPHS equals 2^32 (or 2011-07-29 07:50:02 +00:00
utils Make Record Name an Init 2011-08-10 18:27:46 +00:00
website
.gitignore .gitignore: Ignore /autom4te.cache. We can execute "PATH=/path/to/autotools/bin autoconf/AutoRegen.sh". 2011-08-12 07:47:50 +00:00
build-for-llvm-top.sh
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configure configure: Update since r136721. 2011-08-12 01:50:43 +00:00
CREDITS.TXT I am the code owner for Clang's IR generation; this has been true 2011-08-02 01:38:19 +00:00
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