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c87c50a39c
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Chris Lattner c87c50a39c Enhance SRoA to promote allocas that are used by selects in some 
common cases.  This triggers a surprising number of times in SPEC2K6
because min/max idioms end up doing this.  For example, code from the
STL ends up looking like this to SRoA:

  %202 = load i64* %__old_size, align 8, !tbaa !3
  %203 = load i64* %__old_size, align 8, !tbaa !3
  %204 = load i64* %__n, align 8, !tbaa !3
  %205 = icmp ult i64 %203, %204
  %storemerge.i = select i1 %205, i64* %__n, i64* %__old_size
  %206 = load i64* %storemerge.i, align 8, !tbaa !3

We can now promote both the __n and the __old_size allocas.

This addresses another chunk of rdar://7339113, poor codegen on
stringswitch.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124088 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-23 22:04:55 +00:00
autoconf autoconf: Add --disable-embed-stdcxx to suppress linking libstdc++.a into llvm.dll with --enable-shared on Cygming. 2010-12-29 03:59:14 +00:00
bindings
cmake Handles libffi on the CMake build. 2011-01-21 15:42:54 +00:00
docs Handles libffi on the CMake build. 2011-01-21 15:42:54 +00:00
examples
include Add support for the --noexecstack option. 2011-01-23 17:55:27 +00:00
lib Enhance SRoA to promote allocas that are used by selects in some 2011-01-23 22:04:55 +00:00
projects
runtime
test Enhance SRoA to promote allocas that are used by selects in some 2011-01-23 22:04:55 +00:00
tools Add support for the --noexecstack option. 2011-01-23 17:55:27 +00:00
unittests Clang was not parsing target triples involving EABI and was generating wrong IR (wrong PCS) and passing the wrong information down llc via the target-triple printed in IR. I've fixed this by adding the parsing of EABI into LLVM's Triple class and using it to choose the correct PCS in Clang's Tools. A Clang patch is on its way to use this infrastructure. 2011-01-21 18:25:47 +00:00
utils ARM uses '.' in their tokens. Give it a name instead of a numeric value. 2011-01-22 09:44:32 +00:00
website
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CMakeLists.txt Handles libffi on the CMake build. 2011-01-21 15:42:54 +00:00
configure autoconf: Add --disable-embed-stdcxx to suppress linking libstdc++.a into llvm.dll with --enable-shared on Cygming. 2010-12-29 03:59:14 +00:00
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Makefile.config.in autoconf: Add --disable-embed-stdcxx to suppress linking libstdc++.a into llvm.dll with --enable-shared on Cygming. 2010-12-29 03:59:14 +00:00
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