Jakob Stoklund Olesen 8bcde2aa66 Enable register mask operands for x86 calls. ... Call instructions no longer have a list of 43 call-clobbered registers. Instead, they get a single register mask operand with a bit vector of call-preserved registers. This saves a lot of memory, 42 x 32 bytes = 1344 bytes per call instruction, and it speeds up building call instructions because those 43 imp-def operands no longer need to be added to use-def lists. (And removed and shifted and re-added for every explicit call operand). Passes like LiveVariables, LiveIntervals, RAGreedy, PEI, and BranchFolding are significantly faster because they can deal with call clobbers in bulk. Overall, clang -O2 is between 0% and 8% faster, uniformly distributed depending on call density in the compiled code. Debug builds using clang -O0 are 0% - 3% faster. I have verified that this patch doesn't change the assembly generated for the LLVM nightly test suite when building with -disable-copyprop and -disable-branch-fold. Branch folding behaves slightly differently in a few cases because call instructions have different hash values now. Copy propagation flushes its data structures when it crosses a register mask operand. This causes it to leave a few dead copies behind, on the order of 20 instruction across the entire nightly test suite, including SPEC. Fixing this properly would require the pass to use different data structures. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150638 91177308-0d34-0410-b5e6-96231b3b80d8		2012-02-16 00:02:50 +00:00
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Analysis	Have AliasSet::aliasesUnknownInst use pointer TBAA info when available	2012-02-10 15:52:39 +00:00
Archive	Avoid using an invalidated iterator.	2012-01-23 05:07:16 +00:00
AsmParser	Convert assert(0) to llvm_unreachable	2012-02-07 05:05:23 +00:00
Bitcode	Enable streaming of bitcode	2012-02-06 22:30:29 +00:00
CodeGen	Handle register masks in branch folding.	2012-02-15 23:42:54 +00:00
DebugInfo	More dead code removal (using -Wunreachable-code)	2012-01-20 21:51:11 +00:00
ExecutionEngine	Using the new external-linkage warning recently added instead of disabling all return type warnings.	2012-02-14 21:44:03 +00:00
Linker	Capitalize messages so that they appear nicely with the linker's error messages.	2012-02-14 09:13:54 +00:00
MC	For ELF, also call fixSymbolsInTLSFixups() on expressions passed to EmitValue (literal values). Previously only called on expressions in instructions. New test cases added to tls.s, tls-i386.s. Resolves PR11981.	2012-02-15 15:09:06 +00:00
Object	Expose the ELFObjectFile class directly in the Object/ELF.h header, similarly	2012-02-12 06:12:10 +00:00
Support	Add function for computing the edit distance of two arrays.	2012-02-15 22:13:07 +00:00
TableGen	Convert assert(0) to llvm_unreachable	2012-02-07 05:05:23 +00:00
Target	Enable register mask operands for x86 calls.	2012-02-16 00:02:50 +00:00
Transforms	[tsan] fix compiler warnings	2012-02-14 00:52:07 +00:00
VMCore	Use the enum instead of 'unsigned'.	2012-02-15 23:27:50 +00:00
CMakeLists.txt	Move TableGen's parser and entry point into a library	2011-10-01 16:41:13 +00:00
LLVMBuild.txt	LLVMBuild: Introduce a common section which currently has a list of the	2011-12-12 22:45:54 +00:00
Makefile	Remove more of llvmc and dependencies.	2011-09-20 00:34:27 +00:00