Fix Timer::ticks() on x86-64.

Using =A is not the right constraint for x86-64. rdtsc is actually used as an example in the gcc documentation and for x86-64 something like "=a"(tickl),"=d"(tickh) should be used. Instead of worrying about this we can just use the builtin. Change-Id: Ied720de0861ff9231a4a4cdf85b75945fe478056 Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/34108 Kokoro-Presubmit: kokoro <noreply+kokoro@google.com> Reviewed-by: Nicolas Capens <nicolascapens@google.com> Tested-by: Jeff Muizelaar <jmuizelaar@mozilla.com>

Fix Timer::ticks() on x86-64.
221a2746 · Jeff Muizelaar · Jeff Muizelaar · 4cd9767e · 221a2746
Commit 221a2746 authored Jul 13, 2019 by Jeff Muizelaar Committed by Jeff Muizelaar Jul 15, 2019
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Timer.cpp src/Common/Timer.cpp +1 -3

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--- a/src/Common/Timer.cpp
+++ b/src/Common/Timer.cpp
@@ -65,9 +65,7 @@ namespace sw
 				return __rdtsc();
 			#endif
 		#elif defined(__i386__) || defined(__x86_64__)
-			int64_t tsc;
+			return __builtin_ia32_rdtsc();
-			__asm volatile("rdtsc": "=A" (tsc));
-			return tsc;
 		#else
 			return 0;
 		#endif