Chris Lattner cf9d0acfef Fold the PPCISD shifts when presented with 0 inputs. This occurs for code ... like: long long test(long long X, int Y) { return 1ULL << Y; } long long test2(long long X, int Y) { return -1LL << Y; } which we used to compile to: _test: li r2, 1 subfic r3, r5, 32 li r4, 0 addi r6, r5, -32 srw r3, r2, r3 slw r4, r4, r5 slw r6, r2, r6 or r3, r4, r3 slw r4, r2, r5 or r3, r3, r6 blr _test2: li r2, -1 subfic r3, r5, 32 addi r6, r5, -32 srw r3, r2, r3 slw r4, r2, r5 slw r2, r2, r6 or r3, r4, r3 or r3, r3, r2 blr Now we produce: _test: li r2, 1 addi r3, r5, -32 subfic r4, r5, 32 slw r3, r2, r3 srw r4, r2, r4 or r3, r4, r3 slw r4, r2, r5 blr _test2: li r2, -1 subfic r3, r5, 32 addi r6, r5, -32 srw r3, r2, r3 slw r4, r2, r5 slw r2, r2, r6 or r3, r4, r3 or r3, r3, r2 blr git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30479 91177308-0d34-0410-b5e6-96231b3b80d8		2006-09-19 05:22:59 +00:00
..
Analysis	Explain change with a comment.	2006-09-17 17:51:00 +00:00
Archive	For PR797:	2006-08-25 19:54:53 +00:00
AsmParser	Added some eye-candy for Subtarget type checking	2006-09-17 20:25:45 +00:00
Bytecode	Small fixes for supporting dll* linkage types	2006-09-17 13:06:18 +00:00
CodeGen	Fold extract_element(cst) to cst	2006-09-19 05:02:39 +00:00
Debugger	For PR797:	2006-08-25 17:43:11 +00:00
ExecutionEngine	Unbreak the JIT	2006-09-15 04:56:11 +00:00
Linker	Adding dllimport, dllexport and external weak linkage types.	2006-09-14 18:23:27 +00:00
Support	Instantiate Statistic<> in one place, not in every .o file that uses it.	2006-08-30 04:17:00 +00:00
System	Use new config.h macro	2006-09-14 06:21:59 +00:00
Target	Fold the PPCISD shifts when presented with 0 inputs. This occurs for code	2006-09-19 05:22:59 +00:00
Transforms	Walk down the dominator tree instead of the control flow graph. That means	2006-09-18 21:09:35 +00:00
VMCore	add a helper method	2006-09-18 04:54:57 +00:00
Makefile	Make some changes suggested by Chris:	2006-05-17 22:55:35 +00:00