Hal Finkel 4e703f82f2 [PowerPC] Add a DAGToDAG peephole to remove unnecessary zero-exts ... On PPC64, we end up with lots of i32 -> i64 zero extensions, not only from all of the usual places, but also from the ABI, which specifies that values passed are zero extended. Almost all 32-bit PPC instructions in PPC64 mode are defined to do *something* to the higher-order bits, and for some instructions, that action clears those bits (thus providing a zero-extended result). This is especially common after rotate-and-mask instructions. Adding an additional instruction to zero-extend the results of these instructions is unnecessary. This PPCISelDAGToDAG peephole optimization examines these zero-extensions, and looks back through their operands to see if all instructions will implicitly zero extend their results. If so, we convert these instructions to their 64-bit variants (which is an internal change only, the actual encoding of these instructions is the same as the original 32-bit ones) and remove the unnecessary zero-extension (changing where the INSERT_SUBREG instructions are to make everything internally consistent). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224169 91177308-0d34-0410-b5e6-96231b3b80d8		2014-12-12 23:59:36 +00:00
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AArch64	[AArch64] MachO large code-model: Materialize FP constants in code.	2014-12-10 19:43:32 +00:00
ARM	Emit Tag_ABI_FP_16bit_format build attribute.	2014-12-12 11:59:18 +00:00
CPP
Generic
Hexagon
Inputs
Mips	[mips] Enable code generation for MIPS-III.	2014-12-12 15:16:46 +00:00
MSP430
NVPTX	IR: Canonicalize metadata formatting, NFC	2014-12-11 06:32:29 +00:00
PowerPC	[PowerPC] Add a DAGToDAG peephole to remove unnecessary zero-exts	2014-12-12 23:59:36 +00:00
R600	R600: Fix min/max matching problems with unordered compares	2014-12-12 02:30:37 +00:00
SPARC
SystemZ
Thumb	Re-add support to llvm-objdump for Mach-O universal files and archives with -macho	2014-12-04 23:56:27 +00:00
Thumb2	[ARMConstantIsland] Insert tbb/tbh optimization where previous jump table resided.	2014-12-12 23:27:40 +00:00
X86	[AVX512] Enabling bit logic lowering	2014-12-12 17:02:18 +00:00
XCore