Uses #pragma GCC reset_options to re-enable optimizations after ReduceLarge function

crypto/p224.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This is an implementation of the P224 elliptic curve group. It's written to
 // be short and simple rather than fast, although it's still constant-time.
 //
 // See http://www.imperialviolet.org/2010/12/04/ecc.html ([1]) for background.
 
 #include "crypto/p224.h"
@@ skipping 157 matching lines @@
   (*out)[0] = static_cast<uint32>(in[0] & kBottom28Bits);
   (*out)[1] += static_cast<uint32>((in[0] >> 28) & kBottom28Bits);
   (*out)[2] += static_cast<uint32>(in[0] >> 56);
   // out[0] < 2**28
   // out[1..4] < 2**29
   // out[5..7] < 2**28
 }
 
 // TODO(wez): Remove this when crbug.com/439566 is fixed.
 #if defined(__GNUC__) && !defined(__clang__)
-#pragma GCC optimize("tree-vectorize")
+// Reenable "tree-vectorize" optimization if it got disabled for ReduceLarge.
+#pragma GCC reset_options
 #endif
 
 // Mul computes *out = a*b
 //
 // a[i] < 2**29, b[i] < 2**30 (or vice versa)
 // out[i] < 2**29
 void Mul(FieldElement* out, const FieldElement& a, const FieldElement& b) {
   LargeFieldElement tmp;
   memset(&tmp, 0, sizeof(tmp));
 
@@ skipping 559 matching lines @@
   Subtract(&out->y, kP, y);
   Reduce(&out->y);
 
   memset(&out->z, 0, sizeof(out->z));
   out->z[0] = 1;
 }
 
 }  // namespace p224
 
 }  // namespace crypto