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LLVM backend for 6502
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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
autoconf Recognize an IA64 when we see one 2005-03-17 20:56:22 +00:00
docs * Put command-line switches and function names in <tt> 2005-03-30 19:14:24 +00:00
examples
include/llvm Allow targets which produce setcc results in non-MVT::i1 registers to describe 2005-04-07 19:41:18 +00:00
lib If a target zero or sign extends the result of its setcc, allow folding of 2005-04-07 19:43:53 +00:00
projects Rename createPromoteMemoryToRegister() to 2005-03-28 02:01:12 +00:00
runtime Fix grammar 2005-03-23 21:14:33 +00:00
test match case change in codegen 2005-04-07 17:47:00 +00:00
tools there is no reason to run -instcombine -instcombine! 2005-03-29 06:25:11 +00:00
utils spiff up the nightly tester output one more notch 2005-03-17 16:07:45 +00:00
win32
.cvsignore
configure Recognize an IA64 when we see one 2005-03-17 20:56:22 +00:00
CREDITS.TXT Updating my entry. 2005-03-22 21:33:19 +00:00
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