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Kay Tiong Khoo a570b5adb5 Improved fix for PR17827 (instcombine of shift/and/compare). 
This change fixes the case of arithmetic shift right - do not attempt to fold that case.
This change also relaxes the conditions when attempting to fold the logical shift right and shift left cases.

No additional IR-level test cases included at this time. See http://llvm.org/bugs/show_bug.cgi?id=17827 for proofs that these are correct transformations.

llvm-svn: 197705
 		2013-12-19 18:07:17 +00:00
..
Analysis [block-freq] Teach branch probability how to return the edge weight in between a BasicBlock and one of its successors. 2013-12-14 02:24:25 +00:00
AsmParser Begin adding docs and IR-level support for the inalloca attribute 2013-12-19 02:14:12 +00:00
Bitcode Begin adding docs and IR-level support for the inalloca attribute 2013-12-19 02:14:12 +00:00
CodeGen [stackprotector] Use analysis from the StackProtector pass for stack layout in PEI a nd LocalStackSlot passes. 2013-12-19 03:17:11 +00:00
DebugInfo DebugInfo: Move type units into the debug_types section with appropriate comdat grouping and type unit headers 2013-12-13 21:33:40 +00:00
ExecutionEngine There are no __register_frame and __deregister_frame functions 2013-12-17 08:40:11 +00:00
IR GCOV.cpp: Fix format strings, %lf. Don't use %lf to double. 2013-12-19 08:46:28 +00:00
IRReader [llvm-c] Expose IRReader interface 2013-11-06 09:21:15 +00:00
LTO Add TargetLibraryInfo in LTO passes builder 2013-12-12 01:37:39 +00:00
Linker Revert "Move copying of global initializers below the cloning of functions." 2013-11-09 00:43:18 +00:00
MC AsmParser: add support for .end directive 2013-12-18 02:53:03 +00:00
Object Support for microMIPS TLS relocations. 2013-12-19 16:02:32 +00:00
Option Avoid buffer copies when a Twine already is a StringRef. 2013-12-03 18:18:28 +00:00
Support Pull in a couple of new constants from the upcoming DWARF 5 standard. 2013-12-18 21:48:14 +00:00
TableGen Fix most memory leaks in tablegen. 2013-10-31 04:07:41 +00:00
Target Small simplification, p0 is the same as p. 2013-12-19 16:51:03 +00:00
Transforms Improved fix for PR17827 (instcombine of shift/and/compare). 2013-12-19 18:07:17 +00:00
CMakeLists.txt Move LTO support library to a component, allowing it to be tested 2013-09-24 23:52:22 +00:00
LLVMBuild.txt Move LTO support library to a component, allowing it to be tested 2013-09-24 23:52:22 +00:00
Makefile Reformat Makefile. No other changes. 2013-10-30 04:03:03 +00:00