From 018acc5688934a0867e07105fe4c44d88f780cec Mon Sep 17 00:00:00 2001
From: Brecht Van Lommel <brecht@blender.org>
Date: Wed, 11 May 2022 23:56:06 +0200
Subject: Build: patch USD to avoid using rdtscp instruction not available on
 older CPUs

Disable the new more accurate timing code, this is not needed for Blender.
In USD itself this code is disabled on macOS anyway, so it should operate fine
without it.

Ref T97950, T95206

Differential Revision: https://developer.blender.org/D14928
---
 build_files/build_environment/patches/usd.diff | 49 ++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/build_files/build_environment/patches/usd.diff b/build_files/build_environment/patches/usd.diff
index eb5905109a7..3d0aa4498b7 100644
--- a/build_files/build_environment/patches/usd.diff
+++ b/build_files/build_environment/patches/usd.diff
@@ -51,3 +51,52 @@ diff --git a/pxr/usd/sdr/shaderMetadataHelpers.h b/pxr/usd/sdr/shaderMetadataHel
  
  /// \namespace ShaderMetadataHelpers
 
+diff --git a/pxr/base/arch/timing.h b/pxr/base/arch/timing.h
+index 517561f..fda5a1f 100644
+--- a/pxr/base/arch/timing.h
++++ b/pxr/base/arch/timing.h
+@@ -91,6 +91,10 @@ ArchGetTickTime()
+ inline uint64_t
+ ArchGetStartTickTime()
+ {
++    // BLENDER: avoid using rdtsc instruction that is not supported on older CPUs.
++    return ArchGetTickTime();
++
++#if 0
+     uint64_t t;
+ #if defined (ARCH_OS_DARWIN)
+     return ArchGetTickTime();
+@@ -123,6 +127,7 @@ ArchGetStartTickTime()
+ #error "Unsupported architecture."
+ #endif
+   return t;
++#endif
+ }
+ 
+ /// Get a "stop" tick time for measuring an interval of time.  See
+@@ -132,6 +137,10 @@ ArchGetStartTickTime()
+ inline uint64_t
+ ArchGetStopTickTime()
+ {
++    // BLENDER: avoid using rdtsc instruction that is not supported on older CPUs.
++    return ArchGetTickTime();
++
++#if 0
+     uint64_t t;
+ #if defined (ARCH_OS_DARWIN)
+     return ArchGetTickTime();
+@@ -162,11 +171,11 @@ ArchGetStopTickTime()
+ #error "Unsupported architecture."
+ #endif
+   return t;
++#endif
+ }
+ 
+-#if defined (doxygen) ||                                                       \
+-    (!defined(ARCH_OS_DARWIN) && defined(ARCH_CPU_INTEL) &&                    \
+-     (defined(ARCH_COMPILER_CLANG) || defined(ARCH_COMPILER_GCC)))
++// BLENDER: avoid using rdtsc instruction that is not supported on older CPUs.
++#if 0
+ 
+ /// A simple timer class for measuring an interval of time using the
+ /// ArchTickTimer facilities.
-- 
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