ASR

Format: ASR.signPos dest, source1, source2

Phase0: -

Phase1: -

Phase2: ASR.signPos FT5, FT4, S4

Description: Arithmetic Shift Right

FT5 = arithmetic shift right of FT4 by S4 bits, where modifier SignPos indicates position of sign bit;

switch (SignPos)
{
 case TWB:
        sb=31;
        break; // Top Word
 case PWB:
        sb=15;
        break; // Partial Word
 case MTB:
        sb=FT0&0x1F;
        break; // Mask Top
 case FTB:
        sb=FT3&0x1F;
        break; // Find Top
}
FT5=(signed)(FT4<<(31-sb))>>(31+S4-sb)

Example:

uniform highp int a;
uniform highp int b;

void main()
{
    fragColor = vec4(a >> b);
}

1    : mov ft0, ft1, c0, c0
       mov ft2, sh0
       cbs ft3, sh0
       or ft4, _, ft2, _, c0
       asr.twb ft5, ft4, i0
       mov i0, ft5;