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Implement support for -fwrapv, rdar://7221421

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As part of this, pull together trapv handling into the same enum.

This also add support for NSW multiplies.

This also makes PCH disagreement on overflow behavior silent, since it
really doesn't matter except for warnings and codegen (no macros get 
defined etc).

llvm-svn: 106956
This commit is contained in:
Chris Lattner
2010-06-26 21:25:03 +00:00
parent 217e056e40
commit 51924e517b
13 changed files with 125 additions and 73 deletions
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14
clang/lib/Frontend/CompilerInvocation.cpp
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@@ -549,8 +549,11 @@ static void LangOptsToArgs(const LangOptions &Opts,
Res.push_back("-femit-all-decls");
if (Opts.MathErrno)
Res.push_back("-fmath-errno");
if (Opts.OverflowChecking)
Res.push_back("-ftrapv");
switch (Opts.getSignedOverflowBehavior()) {
case LangOptions::SOB_Undefined: break;
case LangOptions::SOB_Defined: Res.push_back("-fwrapv"); break;
case LangOptions::SOB_Trapping: Res.push_back("-ftrapv"); break;
}
if (Opts.HeinousExtensions)
Res.push_back("-fheinous-gnu-extensions");
// Optimize is implicit.
@@ -1257,8 +1260,11 @@ static void ParseLangArgs(LangOptions &Opts, ArgList &Args, InputKind IK,
if (Args.hasArg(OPT_fvisibility_inlines_hidden))
Opts.InlineVisibilityHidden = 1;
Opts.OverflowChecking = Args.hasArg(OPT_ftrapv);
if (Args.hasArg(OPT_ftrapv))
Opts.setSignedOverflowBehavior(LangOptions::SOB_Trapping);
else if (Args.hasArg(OPT_fwrapv))
Opts.setSignedOverflowBehavior(LangOptions::SOB_Defined);
// Mimicing gcc's behavior, trigraphs are only enabled if -trigraphs
// is specified, or -std is set to a conforming mode.