Bill Schmidt 5def9d253a [PPC64LE] Correct vperm -> shuffle transform for little endian ... As discussed in cfe commit r210279, the correct little-endian semantics for the vec_perm Altivec interfaces are implemented by reversing the order of the input vectors and complementing the permute control vector. This converts the desired permute from little endian element order into the big endian element order that the underlying PowerPC vperm instruction uses. This is represented with a ppc_altivec_vperm intrinsic function. The instruction combining pass contains code to convert a ppc_altivec_vperm intrinsic into a vector shuffle operation when the intrinsic has a permute control vector (mask) that is a constant. However, the vector shuffle operation assumes that vector elements are in natural order for their endianness, so for little endian code we will get the wrong result with the existing transformation. This patch reverses the semantic change to vec_perm that was performed in altivec.h by once again swapping the input operands and complementing the permute control vector, returning the element ordering to little endian. The correctness of this code is tested by the new perm.c test added in a previous patch, and by other tests in the test suite that fail without this patch. llvm-svn: 210282		2014-06-05 19:46:04 +00:00
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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.	2014-06-04 15:39:14 +00:00
InstCombineAndOrXor.cpp	Reorder shuffle and binary operation.	2014-05-11 08:46:12 +00:00
InstCombineCalls.cpp	[PPC64LE] Correct vperm -> shuffle transform for little endian	2014-06-05 19:46:04 +00:00
InstCombineCasts.cpp	Rename ComputeMaskedBits to computeKnownBits. "Masked" has been	2014-05-14 21:14:37 +00:00
InstCombineCompares.cpp	Added support to optimize comparisons with "lshr exact" of a constant.	2014-06-02 19:19:04 +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 transforms for single bit tests from Chris's note	2014-06-02 07:24:36 +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	Add a Constant version of stripPointerCasts.	2014-06-04 19:01:48 +00:00
LLVMBuild.txt	LLVMBuild: Remove trailing newline, which irked me.	2011-12-12 19:48:00 +00:00
Makefile