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Add --compiler flags, and break up deep functions

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git-svn-id: file://localhost/svn/verilator/trunk/verilator@913 77ca24e4-aefa-0310-84f0-b9a241c72d87
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Wilson Snyder
2007-04-19 18:20:16 +00:00
parent a216c1e7e4
commit 6a6995187e
16 changed files with 777 additions and 29 deletions
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@@ -246,6 +246,27 @@ output files.
Specifies C++ without SystemC output mode; see also --sc and --sp.
=item --compiler I<compiler-name>
Enables tunings and work-arounds for the specified C++ compiler.
=over 4
=item gcc
Tune for Gnu C++, although generated code should work on almost any
compliant C++ compiler. Currently the default.
=item msvc
Tune for Microsoft Visual C++. This may reduce execution speed as it
enables several workarounds to avoid silly hardcoded limits in MSVC++.
This includes breaking deeply nested parenthesized expressions into
sub-expressions to avoid error C1009, and breaking deep blocks into
functions to avoid error C1061.
=back
=item --coverage
Enables all forms of coverage, alias for --coverage-line, --coverage-user
@@ -691,11 +712,13 @@ fast path, mostly code that is executed every cycle. OPT_SLOW specifies
optimizations for slow-path files (plus tracing), which execute only
rarely, yet take a long time to compile with optimization on. OPT
specifies overall optimization and affects all compiles, including those
OPT_FAST and OPT_SLOW affect. For best results, use OPT="-O2". Nearly the
same results can be had with much better compile times with OPT_FAST="-O1
-fstrict-aliasing". Unfortunately, using the optimizer with SystemC files
can result in compiles taking several minutes. (The SystemC libraries have
many little inlined functions that drive the compiler nuts.)
OPT_FAST and OPT_SLOW affect. For best results, use OPT="-O2", and link
with "-static". Nearly the same results can be had with much better
compile times with OPT_FAST="-O1 -fstrict-aliasing".
Unfortunately, using the optimizer with SystemC files can result in
compiles taking several minutes. (The SystemC libraries have many little
inlined functions that drive the compiler nuts.)
For best results, use GCC 3.3 or newer. GCC 3.2 and earlier have
optimization bugs around pointer aliasing detection, which can result in 2x