| 651f13cea278ec967336033dd032faef0e9fc2ec |
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24-Apr-2014 |
Stephen Hines <srhines@google.com> |
Updated to Clang 3.5a.
Change-Id: I8127eb568f674c2e72635b639a3295381fe8af82
/external/clang/test/CodeGen/PR4611-bitfield-layout.c
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| 72d2dab6058467036df73a5f668036a519043e5b |
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06-Dec-2012 |
Chandler Carruth <chandlerc@gmail.com> |
Rework the bitfield access IR generation to address PR13619 and
generally support the C++11 memory model requirements for bitfield
accesses by relying more heavily on LLVM's memory model.
The primary change this introduces is to move from a manually aligned
and strided access pattern across the bits of the bitfield to a much
simpler lump access of all bits in the bitfield followed by math to
extract the bits relevant for the particular field.
This simplifies the code significantly, but relies on LLVM to
intelligently lowering these integers.
I have tested LLVM's lowering both synthetically and in benchmarks. The
lowering appears to be functional, and there are no really significant
performance regressions. Different code patterns accessing bitfields
will vary in how this impacts them. The only real regressions I'm seeing
are a few patterns where the LLVM code generation for loads that feed
directly into a mask operation don't take advantage of the x86 ability
to do a smaller load and a cheap zero-extension. This doesn't regress
any benchmark in the nightly test suite on my box past the noise
threshold, but my box is quite noisy. I'll be watching the LNT numbers,
and will look into further improvements to the LLVM lowering as needed.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@169489 91177308-0d34-0410-b5e6-96231b3b80d8
/external/clang/test/CodeGen/PR4611-bitfield-layout.c
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| a5728872c7702ddd09537c95bc3cbd20e1f2fb09 |
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15-Dec-2009 |
Daniel Dunbar <daniel@zuster.org> |
Update tests to use %clang_cc1 instead of 'clang-cc' or 'clang -cc1'.
- This is designed to make it obvious that %clang_cc1 is a "test variable"
which is substituted. It is '%clang_cc1' instead of '%clang -cc1' because it
can be useful to redefine what gets run as 'clang -cc1' (for example, to set
a default target).
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@91446 91177308-0d34-0410-b5e6-96231b3b80d8
/external/clang/test/CodeGen/PR4611-bitfield-layout.c
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| 4fcfde4d5c8f25e40720972a5543d538a0dcb220 |
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08-Nov-2009 |
Daniel Dunbar <daniel@zuster.org> |
Eliminate &&s in tests.
- 'for i in $(find . -type f); do sed -e 's#\(RUN:.*[^ ]\) *&& *$#\1#g' $i | FileUpdate $i; done', for the curious.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@86430 91177308-0d34-0410-b5e6-96231b3b80d8
/external/clang/test/CodeGen/PR4611-bitfield-layout.c
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| abdad358b53d0efd1d89ea434b7078600a656d1f |
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27-Jul-2009 |
Anders Carlsson <andersca@mac.com> |
Enable the new struct type builder now that the constant struct builder works. (The old code will still be there until we know that everything works well.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@77190 91177308-0d34-0410-b5e6-96231b3b80d8
/external/clang/test/CodeGen/PR4611-bitfield-layout.c
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| faaec2234f21bf175dd05c723072202cdf39cb2f |
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23-Jul-2009 |
Anders Carlsson <andersca@mac.com> |
Correct a thinko in bitfield layout code. Fixes PR4611.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@76898 91177308-0d34-0410-b5e6-96231b3b80d8
/external/clang/test/CodeGen/PR4611-bitfield-layout.c
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