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Author SHA1 Message Date
Adam Nemet 4ddb8c01b1 [GVN, OptDiag] Print the interesting instructions involved in missed load-elimination 
[recommitting after the fix in r288307]

This includes the intervening store and the load/store that we're trying
to forward from in the optimization remark for the missed load
elimination.

This is hooked up under a new mode in ORE that allows for compile-time
budget for a bit more analysis to print more insightful messages.  This
mode is currently enabled for -fsave-optimization-record (-Rpass is
trickier since it is controlled in the front-end).

With this we can now print the red remark in http://lab.llvm.org:8080/artifacts/opt-view_test-suite/build/SingleSource/Benchmarks/Dhrystone/CMakeFiles/dry.dir/html/_org_test-suite_SingleSource_Benchmarks_Dhrystone_dry.c.html#L446

Differential Revision: https://reviews.llvm.org/D26490

llvm-svn: 288381
 2016-12-01 17:34:50 +00:00
Adam Nemet 8b5fba8081 [GVN, OptDiag] Include the value that is forwarded in load elimination 
[recommitting after the fix in r288307]

This requires some changes to the opt-diag API.  Hal and I have
discussed this at the Dev Meeting and came up with a streaming delimiter
(setExtraArgs) to solve this.

Arguments after this delimiter are only included in the optimization
records and not in the remarks printed in the compiler output.  (Note,
how in the test the content of the YAML file changes but the remarks on
the compiler output don't.)

This implements the green GVN message with a bug fix at line
http://lab.llvm.org:8080/artifacts/opt-view_test-suite/build/SingleSource/Benchmarks/Dhrystone/CMakeFiles/dry.dir/html/_org_test-suite_SingleSource_Benchmarks_Dhrystone_dry.c.html#L446

The fix is that now we properly include the constant value in the
message: "load of type i32 eliminated in favor of 7"

Differential Revision: https://reviews.llvm.org/D26489

llvm-svn: 288380
 2016-12-01 17:34:44 +00:00
Adam Nemet 4d2a6e5998 [GVN] Basic optimization remark support 
[recommitting after the fix in r288307]

Follow-on patches will add more interesting cases.

The goal of this patch-set is to get the GVN messages printed in
opt-viewer from Dhrystone as was presented in my Dev Meeting talk.  This
is the optimization view for the function (the last remark in the
function has a bug which is fixed in this series):
http://lab.llvm.org:8080/artifacts/opt-view_test-suite/build/SingleSource/Benchmarks/Dhrystone/CMakeFiles/dry.dir/html/_org_test-suite_SingleSource_Benchmarks_Dhrystone_dry.c.html#L430

Differential Revision: https://reviews.llvm.org/D26488

llvm-svn: 288370
 2016-12-01 16:40:32 +00:00
Adam Nemet d4717bd8f3 Revert "[GVN] Basic optimization remark support" 
This reverts commit r288210.

The failure on the stage2 LTO build is back.

llvm-svn: 288226
 2016-11-30 01:14:35 +00:00
Adam Nemet d5747be721 [GVN] Basic optimization remark support 
[recommiting patches one-by-one to see which breaks the stage2 LTO bot]

Follow-on patches will add more interesting cases.

The goal of this patch-set is to get the GVN messages printed in
opt-viewer from Dhrystone as was presented in my Dev Meeting talk.  This
is the optimization view for the function (the last remark in the
function has a bug which is fixed in this series):
http://lab.llvm.org:8080/artifacts/opt-view_test-suite/build/SingleSource/Benchmarks/Dhrystone/CMakeFiles/dry.dir/html/_org_test-suite_SingleSource_Benchmarks_Dhrystone_dry.c.html#L430

Differential Revision: https://reviews.llvm.org/D26488

llvm-svn: 288210
 2016-11-29 22:37:01 +00:00
Adam Nemet c2ed4b35b4 Revert "[GVN] Basic optimization remark support" 
This reverts commit r288046.

Trying to see if the revert fixes a compiler crash during a stage2 LTO
build with a GVN backtrace.

llvm-svn: 288179
 2016-11-29 18:32:04 +00:00
Adam Nemet 91d4d93f94 Revert "[GVN, OptDiag] Include the value that is forwarded in load elimination" 
This reverts commit r288047.

Trying to see if the revert fixes a compiler crash during a stage2 LTO
build with a GVN backtrace.

llvm-svn: 288178
 2016-11-29 18:32:00 +00:00
Adam Nemet a4d3d44ec2 Revert "[GVN, OptDiag] Print the interesting instructions involved in missed load-elimination" 
This reverts commit r288090.

Trying to see if the revert fixes a compiler crash during a stage2 LTO
build with a GVN backtrace.

llvm-svn: 288177
 2016-11-29 18:31:53 +00:00
Adam Nemet b9e53c9056 [GVN, OptDiag] Print the interesting instructions involved in missed load-elimination 
This includes the intervening store and the load/store that we're trying
to forward from in the optimization remark for the missed load
elimination.

This is hooked up under a new mode in ORE that allows for compile-time
budget for a bit more analysis to print more insightful messages.  This
mode is currently enabled for -fsave-optimization-record (-Rpass is
trickier since it is controlled in the front-end).

With this we can now print the red remark in http://lab.llvm.org:8080/artifacts/opt-view_test-suite/build/SingleSource/Benchmarks/Dhrystone/CMakeFiles/dry.dir/html/_org_test-suite_SingleSource_Benchmarks_Dhrystone_dry.c.html#L446

Differential Revision: https://reviews.llvm.org/D26490

llvm-svn: 288090
 2016-11-29 00:09:22 +00:00
Adam Nemet a415a9bde6 [GVN, OptDiag] Include the value that is forwarded in load elimination 
This requires some changes to the opt-diag API.  Hal and I have
discussed this at the Dev Meeting and came up with a streaming delimiter
(setExtraArgs) to solve this.

Arguments after this delimiter are only included in the optimization
records and not in the remarks printed in the compiler output.  (Note,
how in the test the content of the YAML file changes but the remarks on
the compiler output don't.)

This implements the green GVN message with a bug fix at line
http://lab.llvm.org:8080/artifacts/opt-view_test-suite/build/SingleSource/Benchmarks/Dhrystone/CMakeFiles/dry.dir/html/_org_test-suite_SingleSource_Benchmarks_Dhrystone_dry.c.html#L446

The fix is that now we properly include the constant value in the
message: "load of type i32 eliminated in favor of 7"

Differential Revision: https://reviews.llvm.org/D26489

llvm-svn: 288047
 2016-11-28 17:45:34 +00:00
Adam Nemet e5112b14b9 [GVN] Basic optimization remark support 
Follow-on patches will add more interesting cases.

The goal of this patch-set is to get the GVN messages printed in
opt-viewer from Dhrystone as was presented in my Dev Meeting talk.  This
is the optimization view for the function (the last remark in the
function has a bug which is fixed in this series):
http://lab.llvm.org:8080/artifacts/opt-view_test-suite/build/SingleSource/Benchmarks/Dhrystone/CMakeFiles/dry.dir/html/_org_test-suite_SingleSource_Benchmarks_Dhrystone_dry.c.html#L430

Differential Revision: https://reviews.llvm.org/D26488

llvm-svn: 288046
 2016-11-28 17:45:28 +00:00