Commit Graph

12 Commits

Author SHA1 Message Date
Nadav Rotem a136939fa9 Reapply r162160 with a fix: Optimize Arith->Trunc->SETCC sequence to allow better compare/branch code.
llvm-svn: 162172
2012-08-18 17:53:03 +00:00
Nadav Rotem c324af609e Revert r162160 because it made a few buildbots fail.
llvm-svn: 162164
2012-08-18 05:02:36 +00:00
Nadav Rotem 2cb14a5c4b The X86 backend has a number of optimizations for SETCC nodes which use
arithmetic instructions. However, when small data types are used, a truncate
node appears between the SETCC node and the arithmetic operation. This patch
adds support for this pattern.

Before:
  xorl  %esi, %edi
  testb %dil, %dil
  setne %al
  ret

After:
  xorb  %dil, %sil
  setne %al
  ret

rdar://12081007

llvm-svn: 162160
2012-08-18 02:43:28 +00:00
Manman Ren 5759d01230 X86 Peephole: fold loads to the source register operand if possible.
Machine CSE and other optimizations can remove instructions so folding
is possible at peephole while not possible at ISel.

This patch is a rework of r160919 and was tested on clang self-host on my local
machine.

rdar://10554090 and rdar://11873276

llvm-svn: 161152
2012-08-02 00:56:42 +00:00
Manman Ren f87dd7c01b Revert r160920 and r160919 due to dragonegg and clang selfhost failure
llvm-svn: 160927
2012-07-29 02:44:09 +00:00
Manman Ren 0fa3ab88ba X86 Peephole: fold loads to the source register operand if possible.
Machine CSE and other optimizations can remove instructions so folding
is possible at peephole while not possible at ISel.

rdar://10554090 and rdar://11873276

llvm-svn: 160919
2012-07-28 16:48:01 +00:00
Andrew Trick 8523b16ff5 Instruction scheduling itinerary for Intel Atom.
Adds an instruction itinerary to all x86 instructions, giving each a default latency of 1, using the InstrItinClass IIC_DEFAULT.

Sets specific latencies for Atom for the instructions in files X86InstrCMovSetCC.td, X86InstrArithmetic.td, X86InstrControl.td, and X86InstrShiftRotate.td. The Atom latencies for the remainder of the x86 instructions will be set in subsequent patches.

Adds a test to verify that the scheduler is working.

Also changes the scheduling preference to "Hybrid" for i386 Atom, while leaving x86_64 as ILP.

Patch by Preston Gurd!

llvm-svn: 149558
2012-02-01 23:20:51 +00:00
Chris Lattner dab2cd543f Fix rdar://7517201, a regression introduced by r92849.
When folding a and(any_ext(load)) both the any_ext and the
load have to have only a single use.

This removes the anyext-uses.ll testcase which started failing
because it is unreduced and unclear what it is testing.

llvm-svn: 92950
2010-01-07 21:59:23 +00:00
Dan Gohman 40503396da Eliminate more uses of llvm-as and llvm-dis.
llvm-svn: 81290
2009-09-08 23:54:48 +00:00
Evan Cheng d1dda5339d Add -march=x86.
llvm-svn: 60135
2008-11-27 00:37:06 +00:00
Tanya Lattner 3cdf542f5a Remove llvm-upgrade and update tests.
llvm-svn: 47432
2008-02-21 07:42:26 +00:00
Chris Lattner 08162d9515 rename tests to avoid a test- prefix when they aren't related to the test instruction.
llvm-svn: 47329
2008-02-19 17:33:52 +00:00