//===----- lib/i386/fp_mode.c - Floaing-point mode utilities -----*- C -*-====// // // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. // See https://llvm.org/LICENSE.txt for license information. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception // //===----------------------------------------------------------------------===// #include "../fp_mode.h" #define X87_TONEAREST 0x0000 #define X87_DOWNWARD 0x0400 #define X87_UPWARD 0x0800 #define X87_TOWARDZERO 0x0c00 #define X87_RMODE_MASK (X87_TONEAREST | X87_UPWARD | X87_DOWNWARD | X87_TOWARDZERO) CRT_FE_ROUND_MODE __fe_getround(void) { // Assume that the rounding mode state for the fpu agrees with the SSE unit. unsigned short cw; __asm__ __volatile__ ("fnstcw %0" : "=m" (cw)); switch (cw & X87_RMODE_MASK) { case X87_TONEAREST: return CRT_FE_TONEAREST; case X87_DOWNWARD: return CRT_FE_DOWNWARD; case X87_UPWARD: return CRT_FE_UPWARD; case X87_TOWARDZERO: return CRT_FE_TOWARDZERO; } return CRT_FE_TONEAREST; } int __fe_raise_inexact(void) { float f = 1.0f, g = 3.0f; __asm__ __volatile__ ("fdivs %1" : "+t" (f) : "m" (g)); return 0; }