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427c25278d
clang does not support the %v to select the AVX encoding, nor the '%d' asm contrain, and for AVX build it requires all 3 arguments. This patch add a new internal header, math-inline-asm.h, that adds functions to abstract the inline asm required differences between gcc and clang. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
78 lines
2.0 KiB
C
78 lines
2.0 KiB
C
/* Math inline asm compat layer
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Copyright (C) 2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _MATH_INLINE_ASM
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#define _MATH_INLINE_ASM
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#include <sys/cdefs.h>
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/* clang does not support the %v to select the AVX encoding, nor the '%d' asm
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contrain, and for AVX build it requires all 3 arguments. */
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#ifdef __clang__
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#if defined __AVX__
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# define VPREFIX "v"
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# define VROUND_ARG ", %0"
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# else
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# define VPREFIX ""
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# define VROUND_ARG ""
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# endif
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# define VARGPREFIX "%"
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#else
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# define VPREFIX "%v"
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# define VARGPREFIX "%d"
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# define VROUND_ARG ""
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#endif
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__extern_always_inline double
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trunc_inline_asm (double x)
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{
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asm (VPREFIX "roundsd $11, " VARGPREFIX "1, %0" VROUND_ARG : "=v" (x)
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: "v" (x));
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return x;
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}
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__extern_always_inline float
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truncf_inline_asm (float x)
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{
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asm (VPREFIX "roundss $11, " VARGPREFIX "1, %0" VROUND_ARG : "=v" (x)
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: "v" (x));
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return x;
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}
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static __always_inline void
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stmxcsr_inline_asm (unsigned int *mxcsr)
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{
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asm volatile (VPREFIX "stmxcsr %0" : "=m" (*mxcsr));
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}
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static __always_inline void
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ldmxcsr_inline_asm (unsigned int *mxcsr)
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{
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asm volatile (VPREFIX "ldmxcsr %0" : : "m" (*mxcsr));
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}
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static __always_inline float
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divss_inline_asm (float x, float y)
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{
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asm volatile (VPREFIX "divss %1, " VARGPREFIX "0" VROUND_ARG
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: "+x" (x) : "x" (y));
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return x;
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}
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#endif
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