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Process the -fno-signed-zeros optimization flag (PR20870)

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The driver currently accepts but ignores the -fno-signed-zeros flag. 
This patch passes the flag through and enables 'nsz' fast-math-flag 
generation in IR.

The existing OpenCL flag for the same functionality is made into an
alias here. It may be removed in a subsequent patch.

This should resolve bug 20870 ( http://llvm.org/bugs/show_bug.cgi?id=20870 );
patches for the optimizer were checked in at:
http://llvm.org/viewvc/llvm-project?view=revision&revision=225050
http://llvm.org/viewvc/llvm-project?view=revision&revision=224583

Differential Revision: http://reviews.llvm.org/D6873

llvm-svn: 226915
This commit is contained in:
Sanjay Patel
2015-01-23 16:40:50 +00:00
parent 6ee521c7eb
commit 76c9e0986c
6 changed files with 28 additions and 5 deletions
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2
clang/lib/Frontend/CompilerInvocation.cpp
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@@ -441,7 +441,7 @@ static bool ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args, InputKind IK,
Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
Args.hasArg(OPT_cl_finite_math_only) ||
Args.hasArg(OPT_cl_fast_relaxed_math));
Opts.NoSignedZeros = Args.hasArg(OPT_cl_no_signed_zeros);
Opts.NoSignedZeros = Args.hasArg(OPT_fno_signed_zeros);
Opts.NoZeroInitializedInBSS = Args.hasArg(OPT_mno_zero_initialized_in_bss);
Opts.BackendOptions = Args.getAllArgValues(OPT_backend_option);
Opts.NumRegisterParameters = getLastArgIntValue(Args, OPT_mregparm, 0, Diags);