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mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-02-19 23:29:20 +00:00
Chris Lattner b3ddfc42af add two dag combines:
(C1-X) == C2 --> X == C1-C2
(X+C1) == C2 --> X == C2-C1

This allows us to compile this:

bool %X(int %X) {
        %Y = add int %X, 14
        %Z = setne int %Y, 12345
        ret bool %Z
}

into this:

_X:
        cmpl $12331, 4(%esp)
        setne %al
        movzbl %al, %eax
        andl $1, %eax
        ret

not this:

_X:
        movl $14, %eax
        addl 4(%esp), %eax
        cmpl $12345, %eax
        setne %al
        movzbl %al, %eax
        andl $1, %eax
        ret

Testcase here: Regression/CodeGen/X86/compare-add.ll

nukage of the and coming up next.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25898 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-02 06:36:13 +00:00
2006-01-27 22:06:01 +00:00
2006-02-02 06:36:13 +00:00
2006-02-02 06:35:38 +00:00
2006-02-01 19:12:23 +00:00
2006-01-08 08:25:38 +00:00
2006-01-03 14:42:06 +00:00
2005-05-18 20:23:20 +00:00
2005-05-18 20:23:20 +00:00
2005-08-25 04:59:49 +00:00
2005-12-21 03:31:53 +00:00
2006-01-27 22:13:12 +00:00

Low Level Virtual Machine (LLVM)
================================

This directory and its subdirectories contain source code for the Low Level 
Virtual Machine, a toolkit for the construction of highly optimized compilers,
optimizers, and runtime environments. 

LLVM is open source software. You may freely distribute it under the terms of
the license agreement found in LICENSE.txt.

Please see the HTML documentation provided in docs/index.html for further
assistance with LLVM.
Description
LLVM backend for 6502
Readme 277 MiB
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