Evan Cheng 79590b8edf Instcombine was transforming: ... %shr = lshr i64 %key, 3 %0 = load i64* %val, align 8 %sub = add i64 %0, -1 %and = and i64 %sub, %shr ret i64 %and to: %shr = lshr i64 %key, 3 %0 = load i64* %val, align 8 %sub = add i64 %0, 2305843009213693951 %and = and i64 %sub, %shr ret i64 %and The demanded bit optimization is actually a pessimization because add -1 would be codegen'ed as a sub 1. Teach the demanded constant shrinking optimization to check for negated constant to make sure it is actually reducing the width of the constant. rdar://11793464 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160101 91177308-0d34-0410-b5e6-96231b3b80d8		2012-07-12 01:45:35 +00:00
..
CMakeLists.txt	llvm/lib: [CMake] Add explicit dependency to intrinsics_gen.	2012-06-24 13:32:01 +00:00
InstCombine.h	instcombine: merge the functions that remove dead allocas and dead mallocs/callocs/...	2012-07-09 18:38:20 +00:00
InstCombineAddSub.cpp	Remove a instcombine transform that (no longer?) makes sense:	2012-06-26 22:03:13 +00:00
InstCombineAndOrXor.cpp	InstCombine: fix a bug when combining (fcmp cc0 x, y) && (fcmp cc1 x, y).	2012-06-14 05:57:42 +00:00
InstCombineCalls.cpp	instcombine: merge the functions that remove dead allocas and dead mallocs/callocs/...	2012-07-09 18:38:20 +00:00
InstCombineCasts.cpp	Revert remaining part of r93200: "Disable folding sext(trunc(x)) -> x"	2012-06-22 16:36:43 +00:00
InstCombineCompares.cpp	InstCombine: factor code better.	2012-06-11 08:01:25 +00:00
InstCombineLoadStoreAlloca.cpp	instcombine: merge the functions that remove dead allocas and dead mallocs/callocs/...	2012-07-09 18:38:20 +00:00
InstCombineMulDivRem.cpp	Look pass zext to strength reduce an udiv. Patch by David Majnemer. rdar://11721329	2012-06-21 22:52:49 +00:00
InstCombinePHI.cpp
InstCombineSelect.cpp	Fix a bug in FoldSelectOpOp. Bitcast ops may change the number of vector elements, which may disagree with the select condition type.	2012-06-07 20:28:57 +00:00
InstCombineShifts.cpp	PR12967: Don't crash when trying to fold a shift that's larger than the type's size.	2012-05-27 22:03:32 +00:00
InstCombineSimplifyDemanded.cpp	Instcombine was transforming:	2012-07-12 01:45:35 +00:00
InstCombineVectorOps.cpp
InstCombineWorklist.h
InstructionCombining.cpp	instcombine: merge the functions that remove dead allocas and dead mallocs/callocs/...	2012-07-09 18:38:20 +00:00
LLVMBuild.txt
Makefile