This adds new options -fdenormal-fp-math and passes through option -ffast-math
to CC1, which are translated to function attributes and can e.g. be mapped on
build attributes FP_exceptions and FP_denormal. Setting these build attributes
allows better selection of floating point libraries.
Differential Revision: https://reviews.llvm.org/D23840
llvm-svn: 280064
diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
index e21f244..901a5a6 100644
--- a/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -576,6 +576,7 @@
Opts.CorrectlyRoundedDivSqrt =
Args.hasArg(OPT_cl_fp32_correctly_rounded_divide_sqrt);
Opts.ReciprocalMath = Args.hasArg(OPT_freciprocal_math);
+ Opts.NoTrappingMath = Args.hasArg(OPT_fno_trapping_math);
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);
@@ -794,6 +795,18 @@
Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
}
+ if (Arg *A = Args.getLastArg(OPT_fdenormal_fp_math_EQ)) {
+ StringRef Val = A->getValue();
+ if (Val == "ieee")
+ Opts.FPDenormalMode = "ieee";
+ else if (Val == "preserve-sign")
+ Opts.FPDenormalMode = "preserve-sign";
+ else if (Val == "positive-zero")
+ Opts.FPDenormalMode = "positive-zero";
+ else
+ Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
+ }
+
if (Arg *A = Args.getLastArg(OPT_fpcc_struct_return, OPT_freg_struct_return)) {
if (A->getOption().matches(OPT_fpcc_struct_return)) {
Opts.setStructReturnConvention(CodeGenOptions::SRCK_OnStack);