llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-01-30 19:35:54 +00:00

History

Chris Lattner 7312a22ed6 enhance the "change or icmp's into switch" xform to handle one value in an

'or sequence' that it doesn't understand.  This allows us to optimize
something insane like this:

int crud (unsigned char c, unsigned x)
 {
   if(((((((((( (int) c <= 32 ||
                    (int) c == 46) || (int) c == 44)
                  || (int) c == 58) || (int) c == 59) || (int) c == 60)
               || (int) c == 62) || (int) c == 34) || (int) c == 92)
            || (int) c == 39) != 0)
     foo();
 }

into:

define i32 @crud(i8 zeroext %c, i32 %x) nounwind ssp noredzone {
entry:
  %cmp = icmp ult i8 %c, 33
  br i1 %cmp, label %if.then, label %switch.early.test

switch.early.test:                                ; preds = %entry
  switch i8 %c, label %if.end [
    i8 39, label %if.then
    i8 44, label %if.then
    i8 58, label %if.then
    i8 59, label %if.then
    i8 60, label %if.then
    i8 62, label %if.then
    i8 46, label %if.then
    i8 92, label %if.then
    i8 34, label %if.then
  ]

by pulling the < comparison out ahead of the newly formed switch.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121680 91177308-0d34-0410-b5e6-96231b3b80d8

2010-12-13 04:50:38 +00:00

Analysis

Revert r121520, which may have introduced miscompilations.

2010-12-10 21:48:28 +00:00

Archive

Revert test/Archive/check_binary_output.ll". It fails on a buildbot.

2010-12-07 05:57:02 +00:00

Assembler

Fix PR 4170 by having ExtractValueInst::getIndexedType() reject out-of-bounds indexing.

2010-12-05 20:50:26 +00:00

Bindings/Ocaml

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