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LLVM backend for 6502
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610f1e2785
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Chris Lattner 610f1e2785 Codegen signed divides by 2 and -2 more efficiently. In particular 
instead of:

s:   ;; X / 2
        movl 4(%esp), %eax
        movl %eax, %ecx
        shrl $31, %ecx
        movl %eax, %edx
        addl %ecx, %edx
        sarl $1, %eax
        ret

t:   ;; X / -2
        movl 4(%esp), %eax
        movl %eax, %ecx
        shrl $31, %ecx
        movl %eax, %edx
        addl %ecx, %edx
        sarl $1, %eax
        negl %eax
        ret

Emit:

s:
        movl 4(%esp), %eax
        cmpl $-2147483648, %eax
        sbbl $-1, %eax
        sarl $1, %eax
        ret

t:
        movl 4(%esp), %eax
        cmpl $-2147483648, %eax
        sbbl $-1, %eax
        sarl $1, %eax
        negl %eax
        ret


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16760 91177308-0d34-0410-b5e6-96231b3b80d8
2004-10-06 04:02:39 +00:00
autoconf Add checks for the ZLIB and BZIP2 header files, not just the libraries. 2004-10-04 22:05:53 +00:00
docs Fix the path to the fixinc'd headers. Patch contributed by Jeff Cohen! 2004-10-06 03:13:47 +00:00
examples Build BFtoLLVM example front-end by default 2004-10-05 18:05:53 +00:00
include/llvm Fix #include flavor 2004-10-04 18:10:18 +00:00
lib Codegen signed divides by 2 and -2 more efficiently. In particular 2004-10-06 04:02:39 +00:00
projects
runtime Disable libprofile as it breaks the build on Sparc (autoconf issues). 2004-09-08 20:30:26 +00:00
test When tail duplicating these functions, the add instruction should not be 2004-10-06 03:26:38 +00:00
tools
utils
.cvsignore
configure Add checks for the ZLIB and BZIP2 header files, not just the libraries. 2004-10-04 22:05:53 +00:00
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README.txt 

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