From aa53b936ec70f2b1adeb7ac9a698fa99ff9622bc Mon Sep 17 00:00:00 2001
From: Lang Hames <lhames@gmail.com>
Date: Fri, 6 Jul 2012 00:59:19 +0000
Subject: Add -ffp-contract = { fast | on | off }   command line option
 support.

This flag sets the 'fp-contract' mode, which controls the formation of fused
floating point operations. Available modes are:

- Fast: Form fused operations anywhere.
- On: Form fused operations where allowed by FP_CONTRACT. This is the default
      mode.
- Off: Don't form fused operations (in future this may be relaxed to forming
       fused operations where it can be proved that the result won't be
       affected).

Currently clang doesn't support the FP_CONTRACT pragma, so the 'On' and 'Off'
modes are equivalent.

llvm-svn: 159794
---
 clang/lib/Driver/Tools.cpp | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

(limited to 'clang/lib/Driver/Tools.cpp')

diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index 98beb2234a7..dd198a1e9d8 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -1805,6 +1805,24 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
       !TrappingMath)
     CmdArgs.push_back("-menable-unsafe-fp-math");
 
+
+  // Validate and pass through -fp-contract option. 
+  if (Arg *A = Args.getLastArg(options::OPT_ffast_math,
+                               options::OPT_ffp_contract)) {
+    if (A->getOption().getID() == options::OPT_ffp_contract) {
+      StringRef Val = A->getValue(Args);
+      if (Val == "fast" || Val == "on" || Val == "off") {
+        CmdArgs.push_back(Args.MakeArgString("-ffp-contract=" + Val));
+      } else {
+        D.Diag(diag::err_drv_unsupported_option_argument)
+          << A->getOption().getName() << Val;
+      }
+    } else { // A is OPT_ffast_math
+      // If fast-math is set then set the fp-contract mode to fast.
+      CmdArgs.push_back(Args.MakeArgString("-ffp-contract=fast"));
+    }
+  }
+
   // We separately look for the '-ffast-math' flag, and if we find it, tell the
   // frontend to provide the appropriate preprocessor macros. This is distinct
   // from enabling any optimizations as it induces a language change which must
-- 
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