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5a6bace3ab
llvm-6502/lib
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Chris Lattner 5a6bace3ab If a target zero or sign extends the result of its setcc, allow folding of 
this into sign/zero extension instructions later.

On PPC, for example, this testcase:

%G = external global sbyte
implementation
void %test(int %X, int %Y) {
  %C = setlt int %X, %Y
  %D = cast bool %C to sbyte
  store sbyte %D, sbyte* %G
  ret void
}

Now codegens to:

        cmpw cr0, r3, r4
        li r3, 1
        li r4, 0
        blt .LBB_test_2 ;
.LBB_test_1:    ;
        or r3, r4, r4
.LBB_test_2:    ;
        addis r2, r2, ha16(L_G$non_lazy_ptr-"L00000$pb")
        lwz r2, lo16(L_G$non_lazy_ptr-"L00000$pb")(r2)
        stb r3, 0(r2)

instead of:

        cmpw cr0, r3, r4
        li r3, 1
        li r4, 0
        blt .LBB_test_2 ;
.LBB_test_1:    ;
        or r3, r4, r4
.LBB_test_2:    ;
***     rlwinm r3, r3, 0, 31, 31
        addis r2, r2, ha16(L_G$non_lazy_ptr-"L00000$pb")
        lwz r2, lo16(L_G$non_lazy_ptr-"L00000$pb")(r2)
        stb r3, 0(r2)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21148 91177308-0d34-0410-b5e6-96231b3b80d8
2005-04-07 19:43:53 +00:00
..
Analysis Don't make this require loopsimplify. It works BETTER with loop simplify 2005-04-06 21:45:00 +00:00
Archive Implement an isBytecodeArchive method to determine if an archive contains 2005-02-26 22:00:32 +00:00
AsmParser don't crash in some bad cases. 2005-03-23 01:29:26 +00:00
Bytecode This mega patch converts us from using Function::a{iterator|begin|end} to 2005-03-15 04:54:21 +00:00
CodeGen If a target zero or sign extends the result of its setcc, allow folding of 2005-04-07 19:43:53 +00:00
Debugger Correct the comments and file header. 2004-12-23 21:16:46 +00:00
ExecutionEngine Fix the missing symbols problem Bill was hitting. Patch contributed by 2005-03-17 15:38:16 +00:00
Linker fix some 80 column violations 2005-03-15 23:03:34 +00:00
Support Timers SHOULD NOT record the time taken to count the bytes allocated in the heap! 2005-03-22 03:20:38 +00:00
System Be slightly more accurate in an error message. 2005-03-02 05:45:56 +00:00
Target PowerPC zero extends setcc results 2005-04-07 19:41:49 +00:00
Transforms Implement the following xforms: 2005-04-07 17:14:51 +00:00
VMCore First step in adding pcmarker intrinsic. Second step (soon) is adding backend support. 2005-03-28 20:05:49 +00:00
Makefile Add the Linker library 2004-11-14 21:54:41 +00:00