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81338a4890
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JF Bastien 81338a4890 Mutate TargetLowering::shouldExpandAtomicRMWInIR to specifically dictate how AtomicRMWInsts are expanded. 
Summary:
In PNaCl, most atomic instructions have their own @llvm.nacl.atomic.* function, each one, with a few exceptions, represents a consistent behaviour across all NaCl-supported targets. Unfortunately, the atomic RMW operations nand, [u]min, and [u]max aren't directly represented by any such @llvm.nacl.atomic.* function. This patch refines shouldExpandAtomicRMWInIR in TargetLowering so that a future `Le32TargetLowering` class can selectively inform the caller how the target desires the atomic RMW instruction to be expanded (ie via load-linked/store-conditional for ARM/AArch64, via cmpxchg for X86/others?, or not at all for Mips) if at all.

This does not represent a behavioural change and as such no tests were added.

Patch by: Richard Diamond.

Reviewers: jfb

Reviewed By: jfb

Subscribers: jfb, aemerson, t.p.northover, llvm-commits

Differential Revision: http://reviews.llvm.org/D7713

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231250 91177308-0d34-0410-b5e6-96231b3b80d8
2015-03-04 15:47:57 +00:00
autoconf
bindings
cmake
docs Document the LLVM "thunk" attribute added back in r226708 2015-03-04 00:08:56 +00:00
examples
include Mutate TargetLowering::shouldExpandAtomicRMWInIR to specifically dictate how AtomicRMWInsts are expanded. 2015-03-04 15:47:57 +00:00
lib Mutate TargetLowering::shouldExpandAtomicRMWInIR to specifically dictate how AtomicRMWInsts are expanded. 2015-03-04 15:47:57 +00:00
projects Reverse the order libc++ and libc++abi are added in CMake. 2015-03-04 01:16:43 +00:00
test [mips][microMIPS] Make usage of ADDU16 and SUBU16 by code generator 2015-03-04 15:47:42 +00:00
tools [llvm-pdbdump] Display full enum definitions. 2015-03-04 06:09:53 +00:00
unittests Explicitly default DenseMapTest::CtorTest::operator= 2015-03-04 07:57:45 +00:00
utils [Tablegen] Use correct result number variables with the pattern nodes they go with when handling SDTCisSameAs. No functional change as they are always both 0 unless you try to define a multi result type profile that uses SDTCisSame on one of the other results. 2015-03-04 09:04:54 +00:00
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CODE_OWNERS.TXT Assume code ownership for the PS4 to ensure patches get reviewed, per the Developer Policy. 2015-01-28 18:33:39 +00:00
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CREDITS.TXT Rise from the dead and update personal info 2014-08-25 17:51:04 +00:00
LICENSE.TXT Remove projects/sample. 2014-03-12 22:40:22 +00:00
llvm.spec.in
LLVMBuild.txt Remove the very substantial, largely unmaintained legacy PGO 2013-10-02 15:42:23 +00:00
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