Rafael Espindola e8075c6877 InstCombine: Improvement to check if signed addition overflows. ... This patch implements two things: 1. If we know one number is positive and another is negative, we return true as signed addition of two opposite signed numbers will never overflow. 2. Implemented TODO : If one of the operands only has one non-zero bit, and if the other operand has a known-zero bit in a more significant place than it (not including the sign bit) the ripple may go up to and fill the zero, but won't change the sign. e.x - (x & ~4) + 1 We make sure that we are ignoring 0 at MSB. Patch by Suyog Sarda. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209746 91177308-0d34-0410-b5e6-96231b3b80d8		2014-05-28 15:30:40 +00:00
..
CMakeLists.txt	Tidy up a bit. No functional change.	2013-04-05 21:20:12 +00:00
InstCombine.h	Rename ComputeMaskedBits to computeKnownBits. "Masked" has been	2014-05-14 21:14:37 +00:00
InstCombineAddSub.cpp	InstCombine: Improvement to check if signed addition overflows.	2014-05-28 15:30:40 +00:00
InstCombineAndOrXor.cpp	Reorder shuffle and binary operation.	2014-05-11 08:46:12 +00:00
InstCombineCalls.cpp	Post-commit fixes for r209643	2014-05-27 16:54:33 +00:00
InstCombineCasts.cpp	Rename ComputeMaskedBits to computeKnownBits. "Masked" has been	2014-05-14 21:14:37 +00:00
InstCombineCompares.cpp	InstCombine: Optimize -x s< cst	2014-05-15 00:02:20 +00:00
InstCombineLoadStoreAlloca.cpp	[C++] Use 'nullptr'. Transforms edition.	2014-04-25 05:29:35 +00:00
InstCombineMulDivRem.cpp	Optimize integral reciprocal (udiv 1, x and sdiv 1, x) to not use division. This fires exactly once in a clang bootstrap, but covers a few different results from http://www.cs.utah.edu/~regehr/souper/	2014-05-14 03:03:05 +00:00
InstCombinePHI.cpp	[C++] Use 'nullptr'. Transforms edition.	2014-04-25 05:29:35 +00:00
InstCombineSelect.cpp	Added inst-combine for 'MIN(MIN(A, 97), 23)' and 'MAX(MAX(A, 23), 97)'	2014-05-19 07:08:32 +00:00
InstCombineShifts.cpp	Reorder shuffle and binary operation.	2014-05-11 08:46:12 +00:00
InstCombineSimplifyDemanded.cpp	Rename ComputeMaskedBits to computeKnownBits. "Masked" has been	2014-05-14 21:14:37 +00:00
InstCombineVectorOps.cpp	Fix type of shuffle resulted from shuffle merge.	2014-05-13 06:07:21 +00:00
InstCombineWorklist.h	[C++] Use 'nullptr'.	2014-04-28 04:05:08 +00:00
InstructionCombining.cpp	Revert r209049 and r209065, "Add support for combining GEPs across PHI nodes"	2014-05-17 14:39:21 +00:00
LLVMBuild.txt
Makefile