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LLVM backend for 6502
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Chris Lattner bfd3e52701 Do not compute the predecessor list for a block unless we need it. 
This speeds up simplifycfg on this program, from 44.87s to 0.29s (with
a profiled build):

 #define CL0(a) case a: goto c;
 #define CL1(a) CL0(a##0) CL0(a##1) CL0(a##2) CL0(a##3) CL0(a##4) CL0(a##5) \
 CL0(a##6) CL0(a##7) CL0(a##8) CL0(a##9)
 #define CL2(a) CL1(a##0) CL1(a##1) CL1(a##2) CL1(a##3) CL1(a##4) CL1(a##5) \
 CL1(a##6) CL1(a##7) CL1(a##8) CL1(a##9)
 #define CL3(a) CL2(a##0) CL2(a##1) CL2(a##2) CL2(a##3) CL2(a##4) CL2(a##5) \
 CL2(a##6) CL2(a##7) CL2(a##8) CL2(a##9)
 #define CL4(a) CL3(a##0) CL3(a##1) CL3(a##2) CL3(a##3) CL3(a##4) CL3(a##5) \
 CL3(a##6) CL3(a##7) CL3(a##8) CL3(a##9)

 void f();

 void a() {
     int b;
  c: switch (b) {
         CL4(1)
     }
 }

This testcase is contrived to expose N^2 behavior, but this patch should speedup
simplifycfg on any programs that use large switch statements.  This testcase
comes from GCC PR17895.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17389 91177308-0d34-0410-b5e6-96231b3b80d8
2004-11-01 06:53:58 +00:00
autoconf Added the poolalloc module to the list of projects to configure, if present. 2004-10-28 13:35:00 +00:00
docs Wrap to 80 cols 2004-10-31 23:24:31 +00:00
examples Change Library Names Not To Conflict With Others When Installed 2004-10-27 23:18:45 +00:00
include/llvm * Do not refer to ActualCallees in CBU, when we can do it locally. 2004-10-31 23:41:26 +00:00
lib Do not compute the predecessor list for a block unless we need it. 2004-11-01 06:53:58 +00:00
projects Change macro names per naming standard in Makefile.rules. 2004-10-30 09:26:22 +00:00
runtime Internalize variable names to prevent recursive assignment. Cleanup docs. 2004-10-30 09:19:36 +00:00
test Internalize variable names to prevent recursive assignment. Cleanup docs. 2004-10-30 09:19:36 +00:00
tools No, really, the library name is `LLVMexecve' 2004-10-31 17:30:52 +00:00
utils Fix patterns to match only one-char words. 2004-10-30 23:11:26 +00:00
.cvsignore
configure Added the poolalloc module to the list of projects to configure, if present. 2004-10-28 13:35:00 +00:00
CREDITS.TXT Give sumant credit too! 2004-10-27 15:54:23 +00:00
LICENSE.TXT Adjust the license files based on the actual content of llvm and llvm-test 2004-09-16 16:41:31 +00:00
llvm.spec
llvm.spec.in
Makefile Internalize variable names to prevent recursive assignment. Cleanup docs. 2004-10-30 09:19:36 +00:00
Makefile.common No really, this is LLVM! 2004-10-30 00:57:52 +00:00
Makefile.config.in Internalize variable names to prevent recursive assignment. Cleanup docs. 2004-10-30 09:19:36 +00:00
Makefile.rules When compiling a file, indicate what build it is for 2004-11-01 06:14:59 +00:00
README.txt Make the text of this file a little more useful. 2004-09-02 22:49:27 +00:00

README.txt 

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