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1fa5773eb1
Compiler inlines trunc and truncf with SSE4.1. But older versions of GCC doesn't inline them with -Os: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121861 Don't use asm statement for trunc and truncf if compiler can inline them with -Os. It removes one register move with GCC 16: __modff_sse41: __modff_sse41: .LFB23: .LFB23: .cfi_startproc .cfi_startproc endbr64 endbr64 subq $24, %rsp subq $24, %rsp .cfi_def_cfa_offset 32 .cfi_def_cfa_offset 32 movq %fs:40, %rax movq %fs:40, %rax movq %rax, 8(%rsp) movq %rax, 8(%rsp) xorl %eax, %eax xorl %eax, %eax movd %xmm0, %eax movd %xmm0, %eax addl %eax, %eax addl %eax, %eax cmpl $-16777216, %eax cmpl $-16777216, %eax je .L7 je .L7 > movaps %xmm0, %xmm3 movaps %xmm0, %xmm4 movaps %xmm0, %xmm4 movss .LC0(%rip), %xmm2 | movss .LC0(%rip), %xmm1 movaps %xmm2, %xmm3 | movaps %xmm1, %xmm2 andps %xmm0, %xmm2 | roundss $11, %xmm3, %xmm3 roundss $11, %xmm0, %xmm1 | subss %xmm3, %xmm4 subss %xmm1, %xmm4 | andps %xmm0, %xmm1 andnps %xmm4, %xmm3 | andnps %xmm4, %xmm2 orps %xmm3, %xmm2 | orps %xmm2, %xmm1 .L3: .L3: movss %xmm1, (%rdi) | movss %xmm3, (%rdi) movq 8(%rsp), %rax movq 8(%rsp), %rax subq %fs:40, %rax subq %fs:40, %rax jne .L8 jne .L8 movaps %xmm2, %xmm0 | movaps %xmm1, %xmm0 addq $24, %rsp addq $24, %rsp .cfi_remember_state .cfi_remember_state .cfi_def_cfa_offset 8 .cfi_def_cfa_offset 8 ret ret Signed-off-by: H.J. Lu <hjl.tools@gmail.com> Reviewed-by: Uros Bizjak <ubizjak@gmail.com>
56 lines
1.5 KiB
C
56 lines
1.5 KiB
C
/* Private inline math functions for x86.
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Copyright (C) 1995-2025 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 X86_MATH_PRIVATE_H
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#define X86_MATH_PRIVATE_H 1
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#include <math.h>
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#include_next <math_private.h>
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__extern_always_inline long double
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__NTH (__ieee754_atan2l (long double y, long double x))
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{
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long double ret;
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__asm__ __volatile__ ("fpatan" : "=t" (ret) : "0" (x), "u" (y) : "st(1)");
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return ret;
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}
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__extern_always_inline double
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__trunc (double x)
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{
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#if HAVE_X86_INLINE_TRUNC || !defined __SSE4_1__
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return trunc (x);
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#else
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asm ("%vroundsd $11, %d1, %0" : "=v" (x) : "v" (x));
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return x;
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#endif
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}
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__extern_always_inline float
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__truncf (float x)
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{
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#if HAVE_X86_INLINE_TRUNC || !defined __SSE4_1__
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return truncf (x);
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#else
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asm ("%vroundss $11, %d1, %0" : "=v" (x) : "v" (x));
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return x;
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#endif
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}
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#endif
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