mpsubw.gml

来自「开放源码的编译器open watcom 1.6.0版的源代码」· GML 代码 · 共 49 行

.func _m_psubw
#include <mmintrin.h>
__m64 _m_psubw(__m64 *m1, __m64 *m2);
.funcend
.desc begin
The signed or unsigned 16-bit words of
.arg m2
are subtracted from the respective signed or unsigned 16-bit words of
.arg m1
and the result is stored in memory.
If any result element does not fit into 16 bits (underflow or
overflow), the lower 16 bits of the result elements are stored (i.e.,
truncation takes place).
.desc end
.return begin
The result of subtracting the packed words of two 64-bit multimedia
values is returned.
.return end
.see begin
.im seemmsub &function.
.see end
.exmp begin
#include <stdio.h>
#include <mmintrin.h>

#define AS_WORDS "%4.4x %4.4x %4.4x %4.4x"
.exmp break
__m64   a;
__m64   b = { 0x0123456789abcdef };
__m64   c = { 0xfedcba9876543210 };

void main()
  {
    a = _m_psubw( b, c );
    printf( "m1="AS_WORDS"\n"
            "m2="AS_WORDS"\n"
            "mm="AS_WORDS"\n",
        b._16[3], b._16[2], b._16[1], b._16[0],
        c._16[3], c._16[2], c._16[1], c._16[0],
        a._16[3], a._16[2], a._16[1], a._16[0] );
  }
.exmp output
m1=0123 4567 89ab cdef
m2=fedc ba98 7654 3210
mm=0247 8acf 1357 9bdf
.exmp end
.class Intel
.system