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digitalmars.D.ldc - Profile Guide Optimization on LDC2 -emit-llvm

reply Prasun Anand <prasunanand.bitsp gmail.com> writes:
Hi,

Recently, I wrote a software in D. I am using ldc2 1.1.0 (DMD 
v2.071.2, LLVM 3.7.1) for compiling. I am interested in PGO and 
profiled the project with 
[ldc-profdata](https://wiki.dlang.org/LDC_LLVM_profiling_instrumentation).

However, I wanted to get a full-report of profiling-data. I find 
that ldc-profdata
provides only two options i.e. show(not very helpful) and merge.

clang is able to generate .bc files that creates report by adding 
an
option -emit-llvm.

How can I get a full-report of profiling data?

Regards,
Prasun
Mar 26 2017
parent reply David Nadlinger via digitalmars-d-ldc <digitalmars-d-ldc puremagic.com> writes:
Hi,

On 27 Mar 2017, at 8:28, Prasun Anand via digitalmars-d-ldc wrote:

 clang is able to generate .bc files that creates report by adding an
 option -emit-llvm.


-emit-llvm causes Clang to emit bitcode instead of object files, and 
LLVM IR instead of textual assembly. The LDC equivalents are -output-ll 
and -output-bc, respectively.

I don't think I have used the report you mention myself, so I'm unsure 
how it relates to that – could you give an example or a link to the 
corresponding Clang documentation?

  — David
Mar 27 2017
parent reply Prasun Anand <prasunanand.bitsp gmail.com> writes:
On Monday, 27 March 2017 at 12:33:04 UTC, David Nadlinger wrote:

 Hi,

 On 27 Mar 2017, at 8:28, Prasun Anand via digitalmars-d-ldc 
 wrote:

 clang is able to generate .bc files that creates report by 
 adding an
 option -emit-llvm.


 -emit-llvm causes Clang to emit bitcode instead of object 
 files, and LLVM IR instead of textual assembly. The LDC 
 equivalents are -output-ll and -output-bc, respectively.

 I don't think I have used the report you mention myself, so I'm 
 unsure how it relates to that – could you give an example or a 
 link to the corresponding Clang documentation?

  — David


Thanks David,

I was looking for how to output bc files and LLVM IR.

Sorry, I am new to LLVM naming conventions. So, I was referring 
to bitcode and LLVM IR as reports.

Regards,
Prasun
Mar 27 2017
next sibling parent Nicholas Wilson <iamthewilsonator hotmail.com> writes:
On Monday, 27 March 2017 at 17:50:28 UTC, Prasun Anand wrote:

 On Monday, 27 March 2017 at 12:33:04 UTC, David Nadlinger wrote:

 Hi,

 On 27 Mar 2017, at 8:28, Prasun Anand via digitalmars-d-ldc 
 wrote:

 [...]


 -emit-llvm causes Clang to emit bitcode instead of object 
 files, and LLVM IR instead of textual assembly. The LDC 
 equivalents are -output-ll and -output-bc, respectively.

 I don't think I have used the report you mention myself, so 
 I'm unsure how it relates to that – could you give an example 
 or a link to the corresponding Clang documentation?

  — David


 Thanks David,

 I was looking for how to output bc files and LLVM IR.

 Sorry, I am new to LLVM naming conventions. So, I was referring 
 to bitcode and LLVM IR as reports.

 Regards,
 Prasun


`-output-bc` and `-output-ll`
Mar 27 2017
prev sibling parent reply David Nadlinger via digitalmars-d-ldc <digitalmars-d-ldc puremagic.com> writes:
Hi Prasun,

On 27 Mar 2017, at 19:50, Prasun Anand via digitalmars-d-ldc wrote:

 Sorry, I am new to LLVM naming conventions. So, I was referring to 
 bitcode and LLVM IR as reports.


No worries, I was just not sure what you were referring to. Actually, to 
be fully correct, bitcode is LLVM IR as well, and I should really be 
speaking about its textual vs. binary forms.

  — David
Apr 03 2017
parent Prasun Anand <prasunanand.bitsp gmail.com> writes:
On Monday, 3 April 2017 at 21:52:46 UTC, David Nadlinger wrote:

 Hi Prasun,

 On 27 Mar 2017, at 19:50, Prasun Anand via digitalmars-d-ldc 
 wrote:

 Sorry, I am new to LLVM naming conventions. So, I was 
 referring to bitcode and LLVM IR as reports.


 No worries, I was just not sure what you were referring to. 
 Actually, to be fully correct, bitcode is LLVM IR as well, and 
 I should really be speaking about its textual vs. binary forms.

  — David


Thanks Nicholas and David.

I have been using gperftools and LLVM IR to understand how PGO
works and for optimizing my project :) .

Regards,
Prasun
Apr 05 2017