Commit Graph

10 Commits

Author SHA1 Message Date
Tom Stellard 0d162b1c4f AMDGPU/SI: Avoid creating unnecessary copies in the SIFixSGPRCopies pass
Summary:
1. Don't try to copy values to and from the same register class.
2. Replace copies with of registers with immediate values with v_mov/s_mov
   instructions.

The main purpose of this change is to make MachineSink do a better job of
determining when it is beneficial to split a critical edge, since the pass
assumes that copies will become move instructions.

This prevents a regression in uniform-cfg.ll if we enable critical edge
splitting for AMDGPU.

Reviewers: arsenm

Subscribers: arsenm, kzhuravl, llvm-commits

Differential Revision: https://reviews.llvm.org/D23408

llvm-svn: 287131
2016-11-16 18:42:17 +00:00
Matt Arsenault 39787bdcbb Reapply "AMDGPU: Don't use offen if it is 0"
This reverts r283003

llvm-svn: 285203
2016-10-26 15:08:16 +00:00
Mehdi Amini 86eeda8e20 Revert "AMDGPU: Don't use offen if it is 0"
This reverts commit r282999.
Tests are not passing: http://lab.llvm.org:8011/builders/clang-x86_64-linux-selfhost-modules/builds/20038

llvm-svn: 283003
2016-10-01 02:35:24 +00:00
Matt Arsenault 3070fdf798 AMDGPU: Don't use offen if it is 0
This removes many re-initializations of a base register to 0.

llvm-svn: 282999
2016-10-01 01:37:15 +00:00
Matt Arsenault 0efdd06b22 AMDGPU: Run LoadStoreVectorizer pass by default
llvm-svn: 281112
2016-09-09 22:29:28 +00:00
Matt Arsenault cb38a6bd35 AMDGPU: Remove SignBitIsZero for mubuf scratch offsets
These instructions do not have the same negative base
address problem that DS instructions do on SI.

llvm-svn: 263964
2016-03-21 18:02:18 +00:00
Matt Arsenault 3a61985b2f AMDGPU: More bits of frame index are known to be zero
The maximum private allocation for the whole GPU is 4G,
so the maximum possible index for a single workitem is the
maximum size divided by the smallest granularity for a dispatch.

This increases the number of known zero high bits, which
enables more offset folding. The maximum private size per
workitem with this is 128M but may be smaller still.

llvm-svn: 262153
2016-02-27 20:26:57 +00:00
Matt Arsenault e4d0c142e8 AMDGPU: Add sdst operand to VOP2b instructions
The VOP3 encoding of these allows any SGPR pair for the i1
output, but this was forced before to always use vcc.
This doesn't yet try to use this, but does add the operand
to the definitions so the main change is adding vcc to the
output of the VOP2 encoding.

llvm-svn: 246358
2015-08-29 07:16:50 +00:00
Tom Stellard 78655fcfdc AMDPGU/SI: Negative offsets aren't allowed in MUBUF's vaddr operand
Reviewers: arsenm

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D11226

llvm-svn: 242434
2015-07-16 19:40:09 +00:00
Tom Stellard 45bb48ea19 R600 -> AMDGPU rename
llvm-svn: 239657
2015-06-13 03:28:10 +00:00