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LLVM backend for 6502
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e27db74a60
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Chris Lattner e27db74a60 improve switch formation to handle small range 
comparisons formed by comparisons.  For example,
this:

void foo(unsigned x) {
  if (x == 0 || x == 1 || x == 3 || x == 4 || x == 6) 
    bar();
}

compiles into:

_foo:                                   ## @foo
## BB#0:                                ## %entry
	cmpl	$6, %edi
	ja	LBB0_2
## BB#1:                                ## %entry
	movl	%edi, %eax
	movl	$91, %ecx
	btq	%rax, %rcx
	jb	LBB0_3

instead of:

_foo:                                   ## @foo
## BB#0:                                ## %entry
	cmpl	$2, %edi
	jb	LBB0_4
## BB#1:                                ## %switch.early.test
	cmpl	$6, %edi
	ja	LBB0_3
## BB#2:                                ## %switch.early.test
	movl	%edi, %eax
	movl	$88, %ecx
	btq	%rax, %rcx
	jb	LBB0_4

This catches a bunch of cases in GCC, which look like this:

 %804 = load i32* @which_alternative, align 4, !tbaa !0
 %805 = icmp ult i32 %804, 2
 %806 = icmp eq i32 %804, 3
 %or.cond121 = or i1 %805, %806
 %807 = icmp eq i32 %804, 4
 %or.cond124 = or i1 %or.cond121, %807
 br i1 %or.cond124, label %.thread, label %808

turning this into a range comparison.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122045 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-17 06:20:15 +00:00
autoconf Use GZIPBIN instead of GZIP. Apparently gzip uses GZIP as an environment 2010-12-10 01:31:51 +00:00
bindings Try to fix ocaml bindings. 2010-10-08 00:36:21 +00:00
cmake Reverting commit to LLVMLibDeps that was inadvertently done in 121649. 2010-12-12 22:28:51 +00:00
docs Fix a typo that Bill spotted. 2010-12-15 23:09:41 +00:00
examples Fix missing includes of "llvm/Analysis/Passes.h" in the tutorials. Thanks 2010-11-16 17:28:22 +00:00
include improve switch formation to handle small range 2010-12-17 06:20:15 +00:00
lib improve switch formation to handle small range 2010-12-17 06:20:15 +00:00
projects Regen configure 2010-12-12 21:42:01 +00:00
runtime
test improve switch formation to handle small range 2010-12-17 06:20:15 +00:00
tools llvm-dis: Fix memory leak. ParseBitcodeFile should be taking ownership of 2010-12-16 22:37:52 +00:00
unittests Complete tests for IntervalMapOverlaps. 2010-12-17 01:31:49 +00:00
utils Neon intrinsic tests need to be compiled for Cortex-A9 for f16 support. 2010-12-17 01:21:03 +00:00
website
.gitignore Oops, didn't mean to ignore .gitignore. 2010-12-16 17:51:14 +00:00
build-for-llvm-top.sh
CMakeLists.txt CMake: Add FileUpdate to the build. 2010-12-09 17:54:44 +00:00
configure Use GZIPBIN instead of GZIP. Apparently gzip uses GZIP as an environment 2010-12-10 01:31:51 +00:00
CREDITS.TXT Another git svn dcommit test. This time let's hope it doesn't kill my repo. 2010-12-10 14:45:10 +00:00
LICENSE.TXT
llvm.spec.in
Makefile Merge System into Support. 2010-11-29 18:16:10 +00:00
Makefile.common
Makefile.config.in Use GZIPBIN instead of GZIP. Apparently gzip uses GZIP as an environment 2010-12-10 01:31:51 +00:00
Makefile.rules build: Shared libraries shouldn't used RPATH on Darwin, only main executables 2010-12-08 02:29:26 +00:00
ModuleInfo.txt Remove trailing space. This is just an excuse to poke the 2010-10-05 20:32:15 +00:00
README.txt Undoing test commit blank space. 2010-09-29 17:39:29 +00:00

README.txt 

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================================

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