clang-p2996

Files

Duncan P. N. Exon Smith 4bc7731a29 InstrProf: Calculate a better function hash

The function hash should change when control flow changes.  This patch
hashes the type of each AST node that affects counters, rather than just
counting how many there are.  These types are combined into a small
enumerator that currently has 16 values.

The new hash algorithm packs the enums for consecutively visited types
into a `uint64_t`.  In order to save space for new types, the types are
assumed to be 6-bit values (instead of 4-bit).  In order to minimize
overhead for functions with little control flow, the `uint64_t` is used
directly as a hash if it never fills up; if it does, it's passed through
an MD5 context.

<rdar://problem/16435801>

llvm-svn: 206397

2014-04-16 16:03:27 +00:00

Inputs

InstrProf: Calculate a better function hash

2014-04-16 16:03:27 +00:00

c-attributes.c

…

c-captured.c

CodeGen: Handle CapturedStmt in instrumentation based profiling

2014-04-15 00:50:54 +00:00

c-counter-overflows.c

PGO: Statically generate data structures

2014-03-17 21:18:30 +00:00

c-general.c

CodeGen: Handle binary conditional operators in PGO instrumentation

2014-04-11 06:10:10 +00:00

c-linkage-available_externally.c

InstrProf: Calculate a better function hash

2014-04-16 16:03:27 +00:00

c-linkage.c

InstrProf: Calculate a better function hash

2014-04-16 16:03:27 +00:00

c-outdated-data.c

CodeGen: Emit warnings for out of date profile data during PGO

2014-04-15 21:22:35 +00:00

c-unprofiled-blocks.c

CodeGen: Don't create branch weight metadata from empty profiles

2014-04-04 02:48:51 +00:00

cxx-class.cpp

PGO: Change runtime prefix from pgo to profile

2014-03-20 20:00:41 +00:00

cxx-lambda.cpp

CodeGen: Fix handling of C++11 lambdas in profiling

2014-04-11 23:06:35 +00:00

cxx-linkage.cpp

InstrProf: Calculate a better function hash

2014-04-16 16:03:27 +00:00

cxx-templates.cpp

CodeGen: Test instrumentation based profiling of templates

2014-04-12 00:54:06 +00:00

cxx-throws.cpp

PGO: Change runtime prefix from pgo to profile

2014-03-20 20:00:41 +00:00

objc-general.m

[PGO] Add simplified branch weights for Objective-C for-collection loops.

2014-03-25 23:26:31 +00:00

README

PGO: Clarify the testing README

2014-03-11 18:18:12 +00:00

README

These are tests for instrumentation based profiling.  This specifically means
the -fprofile-instr-generate and -fprofile-instr-use driver flags.

Tests in this directory should usually test both:

  - the generation of instrumentation (-fprofile-instr-generate), and
  - the use of profile data from instrumented runs (-fprofile-instr-use).

In order to test -fprofile-instr-use without actually running an instrumented
program, .profdata files are checked into Inputs/.

The input source files must include a main function such that building with
-fprofile-instr-generate and running the resulting program generates the same
.profdata file that is consumed by the tests for -fprofile-instr-use.  Even
tests that only check -fprofile-instr-use should include such a main function,
so that profile data can be regenerated as the .profdata file format evolves.