Commit Graph

10 Commits

Author SHA1 Message Date
Fangrui Song eee6a45a13 [CodeGenPrepare][test] Add REQUIRES to two tests after D73754 2020-02-02 09:53:17 -08:00
Eric Christopher cee313d288 Revert "Temporarily Revert "Add basic loop fusion pass.""
The reversion apparently deleted the test/Transforms directory.

Will be re-reverting again.

llvm-svn: 358552
2019-04-17 04:52:47 +00:00
Eric Christopher a863435128 Temporarily Revert "Add basic loop fusion pass."
As it's causing some bot failures (and per request from kbarton).

This reverts commit r358543/ab70da07286e618016e78247e4a24fcb84077fda.

llvm-svn: 358546
2019-04-17 02:12:23 +00:00
Balaram Makam 32bcb5d7fb Revert "[CGP] Merge empty case blocks if no extra moves are added."
This reverts commit r316711. The domtree isn't getting updated correctly.

llvm-svn: 316721
2017-10-27 00:35:18 +00:00
Balaram Makam cddf3c5e1c [CGP] Merge empty case blocks if no extra moves are added.
Summary:
Currently we skip merging when extra moves may be added in the header of switch instead of the case block, if the case block is used as an incoming
block of a PHI. If all the incoming values of the PHIs are non-constants and the destination block is dominated by the switch block then extra moves are likely not added by ISel, so there is no need to skip merging in this case.

Reviewers: efriedma, junbuml, davidxl, hfinkel, qcolombet

Reviewed By: efriedma

Subscribers: dberlin, kuhar, mcrosier, llvm-commits

Differential Revision: https://reviews.llvm.org/D37343

llvm-svn: 316711
2017-10-26 22:34:01 +00:00
Jun Bum Lim 90b6b5074a [CodeGenPrep] Skip merging empty case blocks
This is recommit of r287553 after fixing the invalid loop info after eliminating an empty block and unit test failures in AVR and WebAssembly :

Summary: Merging an empty case block into the header block of switch could cause ISel to add COPY instructions in the header of switch, instead of the case block, if the case block is used as an incoming block of a PHI. This could potentially increase dynamic instructions, especially when the switch is in a loop. I added a test case which was reduced from the benchmark I was targetting.

Reviewers: t.p.northover, mcrosier, manmanren, wmi, joerg, davidxl

Subscribers: joerg, qcolombet, danielcdh, hfinkel, mcrosier, llvm-commits

Differential Revision: https://reviews.llvm.org/D22696

llvm-svn: 289988
2016-12-16 20:38:39 +00:00
Jun Bum Lim f9416af191 Revert "[CodeGenPrep] Skip merging empty case blocks"
This reverts commit r289951.

llvm-svn: 289960
2016-12-16 17:06:14 +00:00
Jun Bum Lim 85347dde27 [CodeGenPrep] Skip merging empty case blocks
This is recommit of r287553 after fixing the invalid loop info after eliminating an empty block:

Summary: Merging an empty case block into the header block of switch could cause ISel to add COPY instructions in the header of switch, instead of the case block, if the case block is used as an incoming block of a PHI. This could potentially increase dynamic instructions, especially when the switch is in a loop. I added a test case which was reduced from the benchmark I was targetting.

Reviewers: t.p.northover, mcrosier, manmanren, wmi, joerg, davidxl

Subscribers: joerg, qcolombet, danielcdh, hfinkel, mcrosier, llvm-commits

Differential Revision: https://reviews.llvm.org/D22696

llvm-svn: 289951
2016-12-16 16:03:31 +00:00
Joerg Sonnenberger caaa82d90d Revert r287553: [CodeGenPrep] Skip merging empty case blocks
It results in assertions in lib/Analysis/BlockFrequencyInfoImpl.cpp line
670 ("Expected irreducible CFG").

llvm-svn: 288052
2016-11-28 18:56:54 +00:00
Jun Bum Lim 82f55c5446 [CodeGenPrep] Skip merging empty case blocks
Summary: Merging an empty case block into the header block of switch could cause
ISel to add COPY instructions in the header of switch, instead of the case
block, if the case block is used as an incoming block of a PHI. This could
potentially increase dynamic instructions, especially when the switch is in a
loop. I added a test case which was reduced from the benchmark I was targetting.

Reviewers: t.p.northover, mcrosier, manmanren, wmi, davidxl

Subscribers: qcolombet, danielcdh, hfinkel, mcrosier, llvm-commits

Differential Revision: https://reviews.llvm.org/D22696

llvm-svn: 287553
2016-11-21 16:47:28 +00:00