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kc3-lang/freetype/include/internal/ftcalc.h
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Author :
Werner Lemberg
Date : 2014-11-19 06:46:23
Hash : a67c43e1
Message : Avoid compiler warnings on x86-64 for `FT_MulFix'. `FT_MulFix' takes `FT_Long' parameters as defined in `freetype.h', but several inline implementations of it in `ftcalc.h' take `FT_Int32' arguments. This is causing compiler warnings on x86-64: If parameters of type `FT_Fixed' (= `FT_Long') are passed to the inline implementation of this function, integer values are truncated from 64bit to 32bit. * include/internal/ftcalc.h (FT_MulFix) [FT_MULFIX_ASSEMBLER]: Add casts.
- include/internal/ftcalc.h
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/***************************************************************************/ /* */ /* ftcalc.h */ /* */ /* Arithmetic computations (specification). */ /* */ /* Copyright 1996-2006, 2008, 2009, 2012-2014 by */ /* David Turner, Robert Wilhelm, and Werner Lemberg. */ /* */ /* This file is part of the FreeType project, and may only be used, */ /* modified, and distributed under the terms of the FreeType project */ /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ /* this file you indicate that you have read the license and */ /* understand and accept it fully. */ /* */ /***************************************************************************/ #ifndef __FTCALC_H__ #define __FTCALC_H__ #include <ft2build.h> #include FT_FREETYPE_H FT_BEGIN_HEADER /*************************************************************************/ /* */ /* FT_MulDiv() and FT_MulFix() are declared in freetype.h. */ /* */ /*************************************************************************/ #ifndef FT_CONFIG_OPTION_NO_ASSEMBLER /* Provide assembler fragments for performance-critical functions. */ /* These must be defined `static __inline__' with GCC. */ #if defined( __CC_ARM ) || defined( __ARMCC__ ) /* RVCT */ #define FT_MULFIX_ASSEMBLER FT_MulFix_arm /* documentation is in freetype.h */ static __inline FT_Int32 FT_MulFix_arm( FT_Int32 a, FT_Int32 b ) { register FT_Int32 t, t2; __asm { smull t2, t, b, a /* (lo=t2,hi=t) = a*b */ mov a, t, asr #31 /* a = (hi >> 31) */ add a, a, #0x8000 /* a += 0x8000 */ adds t2, t2, a /* t2 += a */ adc t, t, #0 /* t += carry */ mov a, t2, lsr #16 /* a = t2 >> 16 */ orr a, a, t, lsl #16 /* a |= t << 16 */ } return a; } #endif /* __CC_ARM || __ARMCC__ */ #ifdef __GNUC__ #if defined( __arm__ ) && \ ( !defined( __thumb__ ) || defined( __thumb2__ ) ) && \ !( defined( __CC_ARM ) || defined( __ARMCC__ ) ) #define FT_MULFIX_ASSEMBLER FT_MulFix_arm /* documentation is in freetype.h */ static __inline__ FT_Int32 FT_MulFix_arm( FT_Int32 a, FT_Int32 b ) { register FT_Int32 t, t2; __asm__ __volatile__ ( "smull %1, %2, %4, %3\n\t" /* (lo=%1,hi=%2) = a*b */ "mov %0, %2, asr #31\n\t" /* %0 = (hi >> 31) */ #if defined( __clang__ ) && defined( __thumb2__ ) "add.w %0, %0, #0x8000\n\t" /* %0 += 0x8000 */ #else "add %0, %0, #0x8000\n\t" /* %0 += 0x8000 */ #endif "adds %1, %1, %0\n\t" /* %1 += %0 */ "adc %2, %2, #0\n\t" /* %2 += carry */ "mov %0, %1, lsr #16\n\t" /* %0 = %1 >> 16 */ "orr %0, %0, %2, lsl #16\n\t" /* %0 |= %2 << 16 */ : "=r"(a), "=&r"(t2), "=&r"(t) : "r"(a), "r"(b) : "cc" ); return a; } #endif /* __arm__ && */ /* ( __thumb2__ || !__thumb__ ) && */ /* !( __CC_ARM || __ARMCC__ ) */ #if defined( __i386__ ) #define FT_MULFIX_ASSEMBLER FT_MulFix_i386 /* documentation is in freetype.h */ static __inline__ FT_Int32 FT_MulFix_i386( FT_Int32 a, FT_Int32 b ) { register FT_Int32 result; __asm__ __volatile__ ( "imul %%edx\n" "movl %%edx, %%ecx\n" "sarl $31, %%ecx\n" "addl $0x8000, %%ecx\n" "addl %%ecx, %%eax\n" "adcl $0, %%edx\n" "shrl $16, %%eax\n" "shll $16, %%edx\n" "addl %%edx, %%eax\n" : "=a"(result), "=d"(b) : "a"(a), "d"(b) : "%ecx", "cc" ); return result; } #endif /* i386 */ #endif /* __GNUC__ */ #ifdef _MSC_VER /* Visual C++ */ #ifdef _M_IX86 #define FT_MULFIX_ASSEMBLER FT_MulFix_i386 /* documentation is in freetype.h */ static __inline FT_Int32 FT_MulFix_i386( FT_Int32 a, FT_Int32 b ) { register FT_Int32 result; __asm { mov eax, a mov edx, b imul edx mov ecx, edx sar ecx, 31 add ecx, 8000h add eax, ecx adc edx, 0 shr eax, 16 shl edx, 16 add eax, edx mov result, eax } return result; } #endif /* _M_IX86 */ #endif /* _MSC_VER */ #if defined( __GNUC__ ) && defined( __x86_64__ ) #define FT_MULFIX_ASSEMBLER FT_MulFix_x86_64 static __inline__ FT_Int32 FT_MulFix_x86_64( FT_Int32 a, FT_Int32 b ) { /* Temporarily disable the warning that C90 doesn't support */ /* `long long'. */ #if __GNUC__ > 4 || ( __GNUC__ == 4 && __GNUC_MINOR__ >= 6 ) #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Wlong-long" #endif #if 1 /* Technically not an assembly fragment, but GCC does a really good */ /* job at inlining it and generating good machine code for it. */ long long ret, tmp; ret = (long long)a * b; tmp = ret >> 63; ret += 0x8000 + tmp; return (FT_Int32)( ret >> 16 ); #else /* For some reason, GCC 4.6 on Ubuntu 12.04 generates invalid machine */ /* code from the lines below. The main issue is that `wide_a' is not */ /* properly initialized by sign-extending `a'. Instead, the generated */ /* machine code assumes that the register that contains `a' on input */ /* can be used directly as a 64-bit value, which is wrong most of the */ /* time. */ long long wide_a = (long long)a; long long wide_b = (long long)b; long long result; __asm__ __volatile__ ( "imul %2, %1\n" "mov %1, %0\n" "sar $63, %0\n" "lea 0x8000(%1, %0), %0\n" "sar $16, %0\n" : "=&r"(result), "=&r"(wide_a) : "r"(wide_b) : "cc" ); return (FT_Int32)result; #endif #if __GNUC__ > 4 || ( __GNUC__ == 4 && __GNUC_MINOR__ >= 6 ) #pragma GCC diagnostic pop #endif } #endif /* __GNUC__ && __x86_64__ */ #endif /* !FT_CONFIG_OPTION_NO_ASSEMBLER */ #ifdef FT_CONFIG_OPTION_INLINE_MULFIX #ifdef FT_MULFIX_ASSEMBLER #define FT_MulFix( a, b ) FT_MULFIX_ASSEMBLER( (FT_Int32)(a), (FT_Int32)(b) ) #endif #endif /*************************************************************************/ /* */ /* <Function> */ /* FT_MulDiv_No_Round */ /* */ /* <Description> */ /* A very simple function used to perform the computation `(a*b)/c' */ /* (without rounding) with maximum accuracy (it uses a 64-bit */ /* intermediate integer whenever necessary). */ /* */ /* This function isn't necessarily as fast as some processor specific */ /* operations, but is at least completely portable. */ /* */ /* <Input> */ /* a :: The first multiplier. */ /* b :: The second multiplier. */ /* c :: The divisor. */ /* */ /* <Return> */ /* The result of `(a*b)/c'. This function never traps when trying to */ /* divide by zero; it simply returns `MaxInt' or `MinInt' depending */ /* on the signs of `a' and `b'. */ /* */ FT_BASE( FT_Long ) FT_MulDiv_No_Round( FT_Long a, FT_Long b, FT_Long c ); /* * A variant of FT_Matrix_Multiply which scales its result afterwards. * The idea is that both `a' and `b' are scaled by factors of 10 so that * the values are as precise as possible to get a correct result during * the 64bit multiplication. Let `sa' and `sb' be the scaling factors of * `a' and `b', respectively, then the scaling factor of the result is * `sa*sb'. */ FT_BASE( void ) FT_Matrix_Multiply_Scaled( const FT_Matrix* a, FT_Matrix *b, FT_Long scaling ); /* * A variant of FT_Vector_Transform. See comments for * FT_Matrix_Multiply_Scaled. */ FT_BASE( void ) FT_Vector_Transform_Scaled( FT_Vector* vector, const FT_Matrix* matrix, FT_Long scaling ); /* * Return -1, 0, or +1, depending on the orientation of a given corner. * We use the Cartesian coordinate system, with positive vertical values * going upwards. The function returns +1 if the corner turns to the * left, -1 to the right, and 0 for undecidable cases. */ FT_BASE( FT_Int ) ft_corner_orientation( FT_Pos in_x, FT_Pos in_y, FT_Pos out_x, FT_Pos out_y ); /* * Return TRUE if a corner is flat or nearly flat. This is equivalent to * saying that the corner point is close to its neighbors, or inside an * ellipse defined by the neighbor focal points to be more precise. */ FT_BASE( FT_Int ) ft_corner_is_flat( FT_Pos in_x, FT_Pos in_y, FT_Pos out_x, FT_Pos out_y ); /* * Return the most significant bit index. */ #ifndef FT_CONFIG_OPTION_NO_ASSEMBLER #if defined( __GNUC__ ) && \ ( __GNUC__ > 3 || ( __GNUC__ == 3 && __GNUC_MINOR__ >= 4 ) ) #if FT_SIZEOF_INT == 4 #define FT_MSB( x ) ( 31 - __builtin_clz( x ) ) #elif FT_SIZEOF_LONG == 4 #define FT_MSB( x ) ( 31 - __builtin_clzl( x ) ) #endif #endif /* __GNUC__ */ #endif /* !FT_CONFIG_OPTION_NO_ASSEMBLER */ #ifndef FT_MSB FT_BASE( FT_Int ) FT_MSB( FT_UInt32 z ); #endif /* * Return sqrt(x*x+y*y), which is the same as `FT_Vector_Length' but uses * two fixed-point arguments instead. */ FT_BASE( FT_Fixed ) FT_Hypot( FT_Fixed x, FT_Fixed y ); #if 0 /*************************************************************************/ /* */ /* <Function> */ /* FT_SqrtFixed */ /* */ /* <Description> */ /* Computes the square root of a 16.16 fixed-point value. */ /* */ /* <Input> */ /* x :: The value to compute the root for. */ /* */ /* <Return> */ /* The result of `sqrt(x)'. */ /* */ /* <Note> */ /* This function is not very fast. */ /* */ FT_BASE( FT_Int32 ) FT_SqrtFixed( FT_Int32 x ); #endif /* 0 */ #define INT_TO_F26DOT6( x ) ( (FT_Long)(x) << 6 ) #define INT_TO_F2DOT14( x ) ( (FT_Long)(x) << 14 ) #define INT_TO_FIXED( x ) ( (FT_Long)(x) << 16 ) #define F2DOT14_TO_FIXED( x ) ( (FT_Long)(x) << 2 ) #define FLOAT_TO_FIXED( x ) ( (FT_Long)( x * 65536.0 ) ) #define FIXED_TO_INT( x ) ( FT_RoundFix( x ) >> 16 ) #define ROUND_F26DOT6( x ) ( x >= 0 ? ( ( (x) + 32 ) & -64 ) \ : ( -( ( 32 - (x) ) & -64 ) ) ) FT_END_HEADER #endif /* __FTCALC_H__ */ /* END */