Bill Schmidt cb25653e71 [PowerPC 1/4] Little-endian adjustments for VSX loads/stores ... This patch addresses the inherent big-endian bias in the lxvd2x, lxvw4x, stxvd2x, and stxvw4x instructions. These instructions load vector elements into registers left-to-right (with the first element loaded into the high-order bits of the register), regardless of the endian setting of the processor. However, these are the only vector memory instructions that permit unaligned storage accesses, so we want to use them for little-endian. To make this work, a lxvd2x or lxvw4x is replaced with an lxvd2x followed by an xxswapd, which swaps the doublewords. This works for lxvw4x as well as lxvd2x, because for lxvw4x on an LE system the vector elements are in LE order (right-to-left) within each doubleword. (Thus after lxvw2x of a <4 x float> the elements will appear as 1, 0, 3, 2. Following the swap, they will appear as 3, 2, 0, 1, as desired.) For stores, an stxvd2x or stxvw4x is replaced with an stxvd2x preceded by an xxswapd. Introduction of extra swap instructions provides correctness, but obviously is not ideal from a performance perspective. Future patches will address this with optimizations to remove most of the introduced swaps, which have proven effective in other implementations. The introduction of the swaps is performed during lowering of LOAD, STORE, INTRINSIC_W_CHAIN, and INTRINSIC_VOID operations. The latter are used to translate intrinsics that specify the VSX loads and stores directly into equivalent sequences for little endian. Thus code that uses vec_vsx_ld and vec_vsx_st does not have to be modified to be ported from BE to LE. We introduce new PPCISD opcodes for LXVD2X, STXVD2X, and XXSWAPD for use during this lowering step. In PPCInstrVSX.td, we add new SDType and SDNode definitions for these (PPClxvd2x, PPCstxvd2x, PPCxxswapd). These are recognized during instruction selection and mapped to the correct instructions. Several tests that were written to use -mcpu=pwr7 or pwr8 are modified to disable VSX on LE variants because code generation changes with this and subsequent patches in this set. I chose to include all of these in the first patch than try to rigorously sort out which tests were broken by one or another of the patches. Sorry about that. The new test vsx-ldst-builtin-le.ll, and the changes to vsx-ldst.ll, are disabled until LE support is enabled because of breakages that occur as noted in those tests. They are re-enabled in patch 4/4. llvm-svn: 223783		2014-12-09 16:35:51 +00:00
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Analysis	InstSimplify: Try to bring back the rest of r223583	2014-12-08 18:30:43 +00:00
AsmParser	Reland r223754	2014-12-09 05:56:09 +00:00
Bitcode	IR: Disallow function-local metadata attachments	2014-12-06 02:29:44 +00:00
CodeGen	Fix a few instances found in SelectionDAG where we were not handling F16 at parity with F32 and F64.	2014-12-09 06:50:39 +00:00
DebugInfo	Make DWARFAcceleratorTable::dump() const.	2014-11-20 16:21:11 +00:00
ExecutionEngine	[MCJIT] Unique-ptrify the RTDyldMemoryManager member of MCJIT. NFC.	2014-12-03 00:51:19 +00:00
IR	ConstantFold: Zero-sized globals might land on top of another global	2014-12-08 19:35:31 +00:00
IRReader	Remove unused variable. NFC.	2014-11-06 23:16:57 +00:00
LineEditor
Linker	Skip declarations in the case of functions.	2014-12-09 08:20:06 +00:00
LTO	Remove StringMap::GetOrCreateValue in favor of StringMap::insert	2014-11-19 05:49:42 +00:00
MC	clang-formatted ranged loops and assignment, NFC.	2014-12-04 08:30:39 +00:00
Object	Move method out of line to make buildbot happy.	2014-12-09 16:18:11 +00:00
Option	Add an overload of getLastArgNoClaim taking two OptSpecifiers.	2014-09-12 19:42:53 +00:00
ProfileData	llvm-cov: Sink some reporting logic into CoverageMapping	2014-11-14 01:50:32 +00:00
Support	Silence warning: variable 'buffer' set but not used.	2014-12-04 21:36:38 +00:00
TableGen	Revert r222957 "Replace std::map<K, V*> with std::map<K, V> to handle ownership and deletion of the values."	2014-11-30 01:20:17 +00:00
Target	[PowerPC 1/4] Little-endian adjustments for VSX loads/stores	2014-12-09 16:35:51 +00:00
Transforms	Teach instcombine to canonicalize "element extraction" from a load of an	2014-12-09 08:55:32 +00:00
CMakeLists.txt
LLVMBuild.txt
Makefile