Commit Graph

8 Commits

Author SHA1 Message Date
Craig Topper 9012028738 [X86] Don't use GR64 register 'and with immediate' instructions if the immediate is zero in the upper 33-bits or upper 57-bits. Use GR32 instructions instead.
Previously the patterns didn't have high enough priority and we would only use the GR32 form if the only the upper 32 or 56 bits were zero.

Fixes PR23100.

llvm-svn: 234075
2015-04-04 02:08:20 +00:00
Chandler Carruth 4190b507c5 Flip the new block-placement pass to be on by default.
This is mostly to test the waters. I'd like to get results from FNT
build bots and other bots running on non-x86 platforms.

This feature has been pretty heavily tested over the last few months by
me, and it fixes several of the execution time regressions caused by the
inlining work by preventing inlining decisions from radically impacting
block layout.

I've seen very large improvements in yacr2 and ackermann benchmarks,
along with the expected noise across all of the benchmark suite whenever
code layout changes. I've analyzed all of the regressions and fixed
them, or found them to be impossible to fix. See my email to llvmdev for
more details.

I'd like for this to be in 3.1 as it complements the inliner changes,
but if any failures are showing up or anyone has concerns, it is just
a flag flip and so can be easily turned off.

I'm switching it on tonight to try and get at least one run through
various folks' performance suites in case SPEC or something else has
serious issues with it. I'll watch bots and revert if anything shows up.

llvm-svn: 154816
2012-04-16 13:49:17 +00:00
Bill Wendling ec713ee4b4 Use –mcpu=generic, so that the test will not fail when run on an Intel Atom
processor, due to the Atom scheduler producing an instruction sequence that is
different from that which is expected.
Patch by Michael Spencer!

llvm-svn: 150736
2012-02-16 22:42:48 +00:00
Lang Hames 0269caafa6 Set EFLAGS correctly in EmitLoweredSelect on X86.
llvm-svn: 149597
2012-02-02 07:48:37 +00:00
Jakob Stoklund Olesen 4949b9a283 Revert r144611 and r144613.
These tests are actually correct, clang was miscompiling ExeDepsFix::processUses.

Evan fixed the miscompilation in r144628.

llvm-svn: 144630
2011-11-15 07:13:03 +00:00
Jakob Stoklund Olesen 14b66375a9 Allow for depencendy-breaking instructions before cvt*.
This should unbreak clang-x86_64-darwin10-RA, but I can't actually
reproduce the failure.

llvm-svn: 144611
2011-11-15 02:29:48 +00:00
Jakob Stoklund Olesen 06b6ccfe90 Update live-in lists when splitting critical edges.
Fixes PR10814. Patch by Jan Sjödin!

llvm-svn: 141960
2011-10-14 17:25:46 +00:00
Owen Anderson d8d1dcc09a Use a more efficient lowering of uint64_t --> float that can take advantage of hardware signed integer conversion without
having to do a double cast (uint64_t --> double --> float).  This is based on the algorithm from compiler_rt's __floatundisf
for X86-64.

llvm-svn: 115634
2010-10-05 17:24:05 +00:00