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af34c3a995
llvm::huge_valf is defined in a header file, so it is initialized multiple times in every compiled unit upon program startup. With non-VC compilers huge_valf is set to a HUGE_VALF which the compiler can probably optimize out. With VC numeric_limits<float>::infinity() does not return a number but a runtime structure member which therotically may change between calls so the compiler does not optimize out the initialization and it happens many times. It can be easily seen by placing a breakpoint on the initialization line. This patch moves llvm::huge_valf initialization to a source file instead of the header. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218567 91177308-0d34-0410-b5e6-96231b3b80d8
33 lines
885 B
C++
33 lines
885 B
C++
//===-- MathExtras.cpp - Implement the MathExtras header --------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the MathExtras.h header
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/MathExtras.h"
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#ifdef _MSC_VER
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#include <limits>
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#else
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#include <math.h>
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#endif
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namespace llvm {
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#if defined(_MSC_VER)
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// Visual Studio defines the HUGE_VAL class of macros using purposeful
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// constant arithmetic overflow, which it then warns on when encountered.
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const float huge_valf = std::numeric_limits<float>::infinity();
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#else
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const float huge_valf = HUGE_VALF;
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#endif
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}
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