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LLVM backend for 6502
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61c77449c7
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Chris Lattner 61c77449c7 fix a fairly serious oversight with switch formation from 
or'd conditions.  Previously we'd compile something like this:

int crud (unsigned char c) {
   return c == 62 || c == 34 || c == 92;
}

into:

  switch i8 %c, label %lor.rhs [
    i8 62, label %lor.end
    i8 34, label %lor.end
  ]

lor.rhs:                                          ; preds = %entry
  %cmp8 = icmp eq i8 %c, 92
  br label %lor.end

lor.end:                                          ; preds = %entry, %entry, %lor.rhs
  %0 = phi i1 [ true, %entry ], [ %cmp8, %lor.rhs ], [ true, %entry ]
  %lor.ext = zext i1 %0 to i32
  ret i32 %lor.ext

which failed to merge the compare-with-92 into the switch.  With this patch
we simplify this all the way to:

  switch i8 %c, label %lor.rhs [
    i8 62, label %lor.end
    i8 34, label %lor.end
    i8 92, label %lor.end
  ]

lor.rhs:                                          ; preds = %entry
  br label %lor.end

lor.end:                                          ; preds = %entry, %entry, %entry, %lor.rhs
  %0 = phi i1 [ true, %entry ], [ false, %lor.rhs ], [ true, %entry ], [ true, %entry ]
  %lor.ext = zext i1 %0 to i32
  ret i32 %lor.ext

which is much better for codegen's switch lowering stuff.  This kicks in 33 times
on 176.gcc (for example) cutting 103 instructions off the generated code.





git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121671 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-13 03:18:54 +00:00
autoconf Use GZIPBIN instead of GZIP. Apparently gzip uses GZIP as an environment 2010-12-10 01:31:51 +00:00
bindings
cmake Reverting commit to LLVMLibDeps that was inadvertently done in 121649. 2010-12-12 22:28:51 +00:00
docs further fixes. 2010-12-13 00:17:12 +00:00
examples
include Introduce a new PartialAlias response for AliasAnalysis. For most 2010-12-10 19:38:58 +00:00
lib fix a fairly serious oversight with switch formation from 2010-12-13 03:18:54 +00:00
projects Regen configure 2010-12-12 21:42:01 +00:00
runtime
test fix a fairly serious oversight with switch formation from 2010-12-13 03:18:54 +00:00
tools macho-dump: Fix CMake build, following up to r121466. 2010-12-10 09:18:26 +00:00
unittests Support/PathV2: Change most functions in the path namespace to return their work 2010-12-07 17:04:04 +00:00
utils Add support for using the `!if' operator when initializing variables: 2010-12-13 01:46:19 +00:00
website
build-for-llvm-top.sh
CMakeLists.txt CMake: Add FileUpdate to the build. 2010-12-09 17:54:44 +00:00
configure Use GZIPBIN instead of GZIP. Apparently gzip uses GZIP as an environment 2010-12-10 01:31:51 +00:00
CREDITS.TXT Another git svn dcommit test. This time let's hope it doesn't kill my repo. 2010-12-10 14:45:10 +00:00
LICENSE.TXT
llvm.spec.in
Makefile Merge System into Support. 2010-11-29 18:16:10 +00:00
Makefile.common
Makefile.config.in Use GZIPBIN instead of GZIP. Apparently gzip uses GZIP as an environment 2010-12-10 01:31:51 +00:00
Makefile.rules build: Shared libraries shouldn't used RPATH on Darwin, only main executables 2010-12-08 02:29:26 +00:00
ModuleInfo.txt
README.txt

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