libjpeg-turbo floating point MIPS functions

gistfile1.txt

$ cat test.c 
typedef short JCOEF;
typedef unsigned char JSAMPLE;
typedef unsigned int JDIMENSION;
typedef JCOEF *JCOEFPTR;        /* useful in a couple of places */

#define GETJSAMPLE(value)  ((int)(value))
#define CENTERJSAMPLE   128
#define FAST_FLOAT float
#define DCTSIZE 8
#define DCTSIZE2 64

typedef JSAMPLE *JSAMPROW;      /* ptr to one image row of pixel samples. */
typedef JSAMPROW *JSAMPARRAY;   /* ptr to some rows (a 2-D sample array) */

void
convsamp_float(JSAMPARRAY sample_data, JDIMENSION start_col,
               FAST_FLOAT *workspace)
{
  register FAST_FLOAT *workspaceptr;
  register JSAMPROW elemptr;
  register int elemr;

  workspaceptr = workspace;
  for (elemr = 0; elemr < DCTSIZE; elemr++) {
    elemptr = sample_data[elemr] + start_col;
#if DCTSIZE == 8                /* unroll the inner loop */
    *workspaceptr++ = (FAST_FLOAT)(GETJSAMPLE(*elemptr++) - CENTERJSAMPLE);
    *workspaceptr++ = (FAST_FLOAT)(GETJSAMPLE(*elemptr++) - CENTERJSAMPLE);
    *workspaceptr++ = (FAST_FLOAT)(GETJSAMPLE(*elemptr++) - CENTERJSAMPLE);
    *workspaceptr++ = (FAST_FLOAT)(GETJSAMPLE(*elemptr++) - CENTERJSAMPLE);
    *workspaceptr++ = (FAST_FLOAT)(GETJSAMPLE(*elemptr++) - CENTERJSAMPLE);
    *workspaceptr++ = (FAST_FLOAT)(GETJSAMPLE(*elemptr++) - CENTERJSAMPLE);
    *workspaceptr++ = (FAST_FLOAT)(GETJSAMPLE(*elemptr++) - CENTERJSAMPLE);
    *workspaceptr++ = (FAST_FLOAT)(GETJSAMPLE(*elemptr++) - CENTERJSAMPLE);
#else
    {
      register int elemc;
      for (elemc = DCTSIZE; elemc > 0; elemc--)
        *workspaceptr++ = (FAST_FLOAT)
                          (GETJSAMPLE(*elemptr++) - CENTERJSAMPLE);
    }
#endif
  }
}

void
quantize_float(JCOEFPTR coef_block, FAST_FLOAT *divisors,
               FAST_FLOAT *workspace)
{
  register FAST_FLOAT temp;
  register int i;
  register JCOEFPTR output_ptr = coef_block;

  for (i = 0; i < DCTSIZE2; i++) {
    /* Apply the quantization and scaling factor */
    temp = workspace[i] * divisors[i];

    /* Round to nearest integer.
     * Since C does not specify the direction of rounding for negative
     * quotients, we have to force the dividend positive for portability.
     * The maximum coefficient size is +-16K (for 12-bit data), so this
     * code should work for either 16-bit or 32-bit ints.
     */
    output_ptr[i] = (JCOEF)((int)(temp + (FAST_FLOAT)16384.5) - 16384);
  }
}









$ mipsel-unknown-linux-gnu-gcc -O2 -c -march=mips32r2 -funroll-loops test.c && mipsel-unknown-linux-gnu-objdump -d test.o

test.o:     file format elf32-tradlittlemips


Disassembly of section .text:

00000000 <convsamp_float>:
   0:	8c830000 	lw	v1,0(a0)
   4:	8c8a0004 	lw	t2,4(a0)
   8:	00654021 	addu	t0,v1,a1
   c:	91020000 	lbu	v0,0(t0)
  10:	01456821 	addu	t5,t2,a1
  14:	2447ff80 	addiu	a3,v0,-128
  18:	44870000 	mtc1	a3,$f0
  1c:	46800060 	cvt.s.w	$f1,$f0
  20:	e4c10000 	swc1	$f1,0(a2)
  24:	91090001 	lbu	t1,1(t0)
  28:	252bff80 	addiu	t3,t1,-128
  2c:	448b1000 	mtc1	t3,$f2
  30:	468010e0 	cvt.s.w	$f3,$f2
  34:	e4c30004 	swc1	$f3,4(a2)
  38:	910c0002 	lbu	t4,2(t0)
  3c:	258eff80 	addiu	t6,t4,-128
  40:	448e2000 	mtc1	t6,$f4
  44:	46802160 	cvt.s.w	$f5,$f4
  48:	e4c50008 	swc1	$f5,8(a2)
  4c:	910f0003 	lbu	t7,3(t0)
  50:	25f8ff80 	addiu	t8,t7,-128
  54:	44983000 	mtc1	t8,$f6
  58:	468031e0 	cvt.s.w	$f7,$f6
  5c:	e4c7000c 	swc1	$f7,12(a2)
  60:	91190004 	lbu	t9,4(t0)
  64:	2723ff80 	addiu	v1,t9,-128
  68:	44834000 	mtc1	v1,$f8
  6c:	46804260 	cvt.s.w	$f9,$f8
  70:	e4c90010 	swc1	$f9,16(a2)
  74:	91020005 	lbu	v0,5(t0)
  78:	2447ff80 	addiu	a3,v0,-128
  7c:	44875000 	mtc1	a3,$f10
  80:	468052e0 	cvt.s.w	$f11,$f10
  84:	e4cb0014 	swc1	$f11,20(a2)
  88:	91090006 	lbu	t1,6(t0)
  8c:	252aff80 	addiu	t2,t1,-128
  90:	448a6000 	mtc1	t2,$f12
  94:	46806360 	cvt.s.w	$f13,$f12
  98:	e4cd0018 	swc1	$f13,24(a2)
  9c:	91080007 	lbu	t0,7(t0)
  a0:	250bff80 	addiu	t3,t0,-128
  a4:	448b7000 	mtc1	t3,$f14
  a8:	468073e0 	cvt.s.w	$f15,$f14
  ac:	e4cf001c 	swc1	$f15,28(a2)
  b0:	91ac0000 	lbu	t4,0(t5)
  b4:	258eff80 	addiu	t6,t4,-128
  b8:	448e8000 	mtc1	t6,$f16
  bc:	46808460 	cvt.s.w	$f17,$f16
  c0:	e4d10020 	swc1	$f17,32(a2)
  c4:	91af0001 	lbu	t7,1(t5)
  c8:	25f8ff80 	addiu	t8,t7,-128
  cc:	44989000 	mtc1	t8,$f18
  d0:	468094e0 	cvt.s.w	$f19,$f18
  d4:	e4d30024 	swc1	$f19,36(a2)
  d8:	91b90002 	lbu	t9,2(t5)
  dc:	2723ff80 	addiu	v1,t9,-128
  e0:	44830000 	mtc1	v1,$f0
  e4:	46800060 	cvt.s.w	$f1,$f0
  e8:	e4c10028 	swc1	$f1,40(a2)
  ec:	91a20003 	lbu	v0,3(t5)
  f0:	2447ff80 	addiu	a3,v0,-128
  f4:	44871000 	mtc1	a3,$f2
  f8:	468010e0 	cvt.s.w	$f3,$f2
  fc:	e4c3002c 	swc1	$f3,44(a2)
 100:	91a90004 	lbu	t1,4(t5)
 104:	252aff80 	addiu	t2,t1,-128
 108:	448a2000 	mtc1	t2,$f4
 10c:	46802160 	cvt.s.w	$f5,$f4
 110:	e4c50030 	swc1	$f5,48(a2)
 114:	91a80005 	lbu	t0,5(t5)
 118:	250bff80 	addiu	t3,t0,-128
 11c:	448b3000 	mtc1	t3,$f6
 120:	468031e0 	cvt.s.w	$f7,$f6
 124:	e4c70034 	swc1	$f7,52(a2)
 128:	91ac0006 	lbu	t4,6(t5)
 12c:	258eff80 	addiu	t6,t4,-128
 130:	448e4000 	mtc1	t6,$f8
 134:	46804260 	cvt.s.w	$f9,$f8
 138:	e4c90038 	swc1	$f9,56(a2)
 13c:	91ad0007 	lbu	t5,7(t5)
 140:	8c8f0008 	lw	t7,8(a0)
 144:	25b8ff80 	addiu	t8,t5,-128
 148:	44985000 	mtc1	t8,$f10
 14c:	01e5c821 	addu	t9,t7,a1
 150:	468052e0 	cvt.s.w	$f11,$f10
 154:	e4cb003c 	swc1	$f11,60(a2)
 158:	93220000 	lbu	v0,0(t9)
 15c:	8c83000c 	lw	v1,12(a0)
 160:	2447ff80 	addiu	a3,v0,-128
 164:	44876000 	mtc1	a3,$f12
 168:	00655021 	addu	t2,v1,a1
 16c:	46806360 	cvt.s.w	$f13,$f12
 170:	e4cd0040 	swc1	$f13,64(a2)
 174:	93290001 	lbu	t1,1(t9)
 178:	2528ff80 	addiu	t0,t1,-128
 17c:	44887000 	mtc1	t0,$f14
 180:	468073e0 	cvt.s.w	$f15,$f14
 184:	e4cf0044 	swc1	$f15,68(a2)
 188:	932b0002 	lbu	t3,2(t9)
 18c:	256cff80 	addiu	t4,t3,-128
 190:	448c8000 	mtc1	t4,$f16
 194:	46808460 	cvt.s.w	$f17,$f16
 198:	e4d10048 	swc1	$f17,72(a2)
 19c:	932e0003 	lbu	t6,3(t9)
 1a0:	25cdff80 	addiu	t5,t6,-128
 1a4:	448d9000 	mtc1	t5,$f18
 1a8:	468094e0 	cvt.s.w	$f19,$f18
 1ac:	e4d3004c 	swc1	$f19,76(a2)
 1b0:	932f0004 	lbu	t7,4(t9)
 1b4:	25f8ff80 	addiu	t8,t7,-128
 1b8:	44980000 	mtc1	t8,$f0
 1bc:	46800060 	cvt.s.w	$f1,$f0
 1c0:	e4c10050 	swc1	$f1,80(a2)
 1c4:	93220005 	lbu	v0,5(t9)
 1c8:	2443ff80 	addiu	v1,v0,-128
 1cc:	44831000 	mtc1	v1,$f2
 1d0:	468010e0 	cvt.s.w	$f3,$f2
 1d4:	e4c30054 	swc1	$f3,84(a2)
 1d8:	93270006 	lbu	a3,6(t9)
 1dc:	24e9ff80 	addiu	t1,a3,-128
 1e0:	44892000 	mtc1	t1,$f4
 1e4:	46802160 	cvt.s.w	$f5,$f4
 1e8:	e4c50058 	swc1	$f5,88(a2)
 1ec:	93390007 	lbu	t9,7(t9)
 1f0:	2728ff80 	addiu	t0,t9,-128
 1f4:	44883000 	mtc1	t0,$f6
 1f8:	468031e0 	cvt.s.w	$f7,$f6
 1fc:	e4c7005c 	swc1	$f7,92(a2)
 200:	914b0000 	lbu	t3,0(t2)
 204:	256cff80 	addiu	t4,t3,-128
 208:	448c4000 	mtc1	t4,$f8
 20c:	46804260 	cvt.s.w	$f9,$f8
 210:	e4c90060 	swc1	$f9,96(a2)
 214:	914e0001 	lbu	t6,1(t2)
 218:	25cdff80 	addiu	t5,t6,-128
 21c:	448d5000 	mtc1	t5,$f10
 220:	468052e0 	cvt.s.w	$f11,$f10
 224:	e4cb0064 	swc1	$f11,100(a2)
 228:	914f0002 	lbu	t7,2(t2)
 22c:	25f8ff80 	addiu	t8,t7,-128
 230:	44986000 	mtc1	t8,$f12
 234:	46806360 	cvt.s.w	$f13,$f12
 238:	e4cd0068 	swc1	$f13,104(a2)
 23c:	91420003 	lbu	v0,3(t2)
 240:	2443ff80 	addiu	v1,v0,-128
 244:	44837000 	mtc1	v1,$f14
 248:	468073e0 	cvt.s.w	$f15,$f14
 24c:	e4cf006c 	swc1	$f15,108(a2)
 250:	91470004 	lbu	a3,4(t2)
 254:	24e9ff80 	addiu	t1,a3,-128
 258:	44898000 	mtc1	t1,$f16
 25c:	46808460 	cvt.s.w	$f17,$f16
 260:	e4d10070 	swc1	$f17,112(a2)
 264:	91590005 	lbu	t9,5(t2)
 268:	2728ff80 	addiu	t0,t9,-128
 26c:	44889000 	mtc1	t0,$f18
 270:	468094e0 	cvt.s.w	$f19,$f18
 274:	e4d30074 	swc1	$f19,116(a2)
 278:	914b0006 	lbu	t3,6(t2)
 27c:	8c8c0010 	lw	t4,16(a0)
 280:	256eff80 	addiu	t6,t3,-128
 284:	448e0000 	mtc1	t6,$f0
 288:	01856821 	addu	t5,t4,a1
 28c:	46800060 	cvt.s.w	$f1,$f0
 290:	e4c10078 	swc1	$f1,120(a2)
 294:	914a0007 	lbu	t2,7(t2)
 298:	8c820014 	lw	v0,20(a0)
 29c:	254fff80 	addiu	t7,t2,-128
 2a0:	448f1000 	mtc1	t7,$f2
 2a4:	00454821 	addu	t1,v0,a1
 2a8:	468010e0 	cvt.s.w	$f3,$f2
 2ac:	e4c3007c 	swc1	$f3,124(a2)
 2b0:	91b80000 	lbu	t8,0(t5)
 2b4:	2703ff80 	addiu	v1,t8,-128
 2b8:	44832000 	mtc1	v1,$f4
 2bc:	46802160 	cvt.s.w	$f5,$f4
 2c0:	e4c50080 	swc1	$f5,128(a2)
 2c4:	91a70001 	lbu	a3,1(t5)
 2c8:	24f9ff80 	addiu	t9,a3,-128
 2cc:	44993000 	mtc1	t9,$f6
 2d0:	468031e0 	cvt.s.w	$f7,$f6
 2d4:	e4c70084 	swc1	$f7,132(a2)
 2d8:	91a80002 	lbu	t0,2(t5)
 2dc:	250bff80 	addiu	t3,t0,-128
 2e0:	448b4000 	mtc1	t3,$f8
 2e4:	46804260 	cvt.s.w	$f9,$f8
 2e8:	e4c90088 	swc1	$f9,136(a2)
 2ec:	91ac0003 	lbu	t4,3(t5)
 2f0:	258eff80 	addiu	t6,t4,-128
 2f4:	448e5000 	mtc1	t6,$f10
 2f8:	468052e0 	cvt.s.w	$f11,$f10
 2fc:	e4cb008c 	swc1	$f11,140(a2)
 300:	91aa0004 	lbu	t2,4(t5)
 304:	254fff80 	addiu	t7,t2,-128
 308:	448f6000 	mtc1	t7,$f12
 30c:	46806360 	cvt.s.w	$f13,$f12
 310:	e4cd0090 	swc1	$f13,144(a2)
 314:	91b80005 	lbu	t8,5(t5)
 318:	2702ff80 	addiu	v0,t8,-128
 31c:	44827000 	mtc1	v0,$f14
 320:	468073e0 	cvt.s.w	$f15,$f14
 324:	e4cf0094 	swc1	$f15,148(a2)
 328:	91a30006 	lbu	v1,6(t5)
 32c:	2467ff80 	addiu	a3,v1,-128
 330:	44878000 	mtc1	a3,$f16
 334:	46808460 	cvt.s.w	$f17,$f16
 338:	e4d10098 	swc1	$f17,152(a2)
 33c:	91ad0007 	lbu	t5,7(t5)
 340:	25b9ff80 	addiu	t9,t5,-128
 344:	44999000 	mtc1	t9,$f18
 348:	468094e0 	cvt.s.w	$f19,$f18
 34c:	e4d3009c 	swc1	$f19,156(a2)
 350:	91280000 	lbu	t0,0(t1)
 354:	250bff80 	addiu	t3,t0,-128
 358:	448b0000 	mtc1	t3,$f0
 35c:	46800060 	cvt.s.w	$f1,$f0
 360:	e4c100a0 	swc1	$f1,160(a2)
 364:	912c0001 	lbu	t4,1(t1)
 368:	258eff80 	addiu	t6,t4,-128
 36c:	448e1000 	mtc1	t6,$f2
 370:	468010e0 	cvt.s.w	$f3,$f2
 374:	e4c300a4 	swc1	$f3,164(a2)
 378:	912a0002 	lbu	t2,2(t1)
 37c:	254fff80 	addiu	t7,t2,-128
 380:	448f2000 	mtc1	t7,$f4
 384:	46802160 	cvt.s.w	$f5,$f4
 388:	e4c500a8 	swc1	$f5,168(a2)
 38c:	91380003 	lbu	t8,3(t1)
 390:	2702ff80 	addiu	v0,t8,-128
 394:	44823000 	mtc1	v0,$f6
 398:	468031e0 	cvt.s.w	$f7,$f6
 39c:	e4c700ac 	swc1	$f7,172(a2)
 3a0:	91230004 	lbu	v1,4(t1)
 3a4:	2467ff80 	addiu	a3,v1,-128
 3a8:	44874000 	mtc1	a3,$f8
 3ac:	46804260 	cvt.s.w	$f9,$f8
 3b0:	e4c900b0 	swc1	$f9,176(a2)
 3b4:	912d0005 	lbu	t5,5(t1)
 3b8:	8c990018 	lw	t9,24(a0)
 3bc:	25a8ff80 	addiu	t0,t5,-128
 3c0:	44885000 	mtc1	t0,$f10
 3c4:	8c84001c 	lw	a0,28(a0)
 3c8:	468052e0 	cvt.s.w	$f11,$f10
 3cc:	e4cb00b4 	swc1	$f11,180(a2)
 3d0:	912b0006 	lbu	t3,6(t1)
 3d4:	03256021 	addu	t4,t9,a1
 3d8:	256eff80 	addiu	t6,t3,-128
 3dc:	448e6000 	mtc1	t6,$f12
 3e0:	00852821 	addu	a1,a0,a1
 3e4:	46806360 	cvt.s.w	$f13,$f12
 3e8:	e4cd00b8 	swc1	$f13,184(a2)
 3ec:	91290007 	lbu	t1,7(t1)
 3f0:	252aff80 	addiu	t2,t1,-128
 3f4:	448a7000 	mtc1	t2,$f14
 3f8:	468073e0 	cvt.s.w	$f15,$f14
 3fc:	e4cf00bc 	swc1	$f15,188(a2)
 400:	918f0000 	lbu	t7,0(t4)
 404:	25f8ff80 	addiu	t8,t7,-128
 408:	44988000 	mtc1	t8,$f16
 40c:	46808460 	cvt.s.w	$f17,$f16
 410:	e4d100c0 	swc1	$f17,192(a2)
 414:	91820001 	lbu	v0,1(t4)
 418:	2443ff80 	addiu	v1,v0,-128
 41c:	44839000 	mtc1	v1,$f18
 420:	468094e0 	cvt.s.w	$f19,$f18
 424:	e4d300c4 	swc1	$f19,196(a2)
 428:	91870002 	lbu	a3,2(t4)
 42c:	24edff80 	addiu	t5,a3,-128
 430:	448d0000 	mtc1	t5,$f0
 434:	46800060 	cvt.s.w	$f1,$f0
 438:	e4c100c8 	swc1	$f1,200(a2)
 43c:	91990003 	lbu	t9,3(t4)
 440:	2728ff80 	addiu	t0,t9,-128
 444:	44881000 	mtc1	t0,$f2
 448:	468010e0 	cvt.s.w	$f3,$f2
 44c:	e4c300cc 	swc1	$f3,204(a2)
 450:	918b0004 	lbu	t3,4(t4)
 454:	256eff80 	addiu	t6,t3,-128
 458:	448e2000 	mtc1	t6,$f4
 45c:	46802160 	cvt.s.w	$f5,$f4
 460:	e4c500d0 	swc1	$f5,208(a2)
 464:	91890005 	lbu	t1,5(t4)
 468:	2524ff80 	addiu	a0,t1,-128
 46c:	44843000 	mtc1	a0,$f6
 470:	468031e0 	cvt.s.w	$f7,$f6
 474:	e4c700d4 	swc1	$f7,212(a2)
 478:	918a0006 	lbu	t2,6(t4)
 47c:	254fff80 	addiu	t7,t2,-128
 480:	448f4000 	mtc1	t7,$f8
 484:	46804260 	cvt.s.w	$f9,$f8
 488:	e4c900d8 	swc1	$f9,216(a2)
 48c:	918c0007 	lbu	t4,7(t4)
 490:	2598ff80 	addiu	t8,t4,-128
 494:	44985000 	mtc1	t8,$f10
 498:	468052e0 	cvt.s.w	$f11,$f10
 49c:	e4cb00dc 	swc1	$f11,220(a2)
 4a0:	90a20000 	lbu	v0,0(a1)
 4a4:	2443ff80 	addiu	v1,v0,-128
 4a8:	44836000 	mtc1	v1,$f12
 4ac:	46806360 	cvt.s.w	$f13,$f12
 4b0:	e4cd00e0 	swc1	$f13,224(a2)
 4b4:	90a70001 	lbu	a3,1(a1)
 4b8:	24edff80 	addiu	t5,a3,-128
 4bc:	448d7000 	mtc1	t5,$f14
 4c0:	468073e0 	cvt.s.w	$f15,$f14
 4c4:	e4cf00e4 	swc1	$f15,228(a2)
 4c8:	90b90002 	lbu	t9,2(a1)
 4cc:	2728ff80 	addiu	t0,t9,-128
 4d0:	44888000 	mtc1	t0,$f16
 4d4:	46808460 	cvt.s.w	$f17,$f16
 4d8:	e4d100e8 	swc1	$f17,232(a2)
 4dc:	90ab0003 	lbu	t3,3(a1)
 4e0:	256eff80 	addiu	t6,t3,-128
 4e4:	448e9000 	mtc1	t6,$f18
 4e8:	468094e0 	cvt.s.w	$f19,$f18
 4ec:	e4d300ec 	swc1	$f19,236(a2)
 4f0:	90a90004 	lbu	t1,4(a1)
 4f4:	2524ff80 	addiu	a0,t1,-128
 4f8:	44840000 	mtc1	a0,$f0
 4fc:	46800060 	cvt.s.w	$f1,$f0
 500:	e4c100f0 	swc1	$f1,240(a2)
 504:	90aa0005 	lbu	t2,5(a1)
 508:	254fff80 	addiu	t7,t2,-128
 50c:	448f1000 	mtc1	t7,$f2
 510:	468010e0 	cvt.s.w	$f3,$f2
 514:	e4c300f4 	swc1	$f3,244(a2)
 518:	90ac0006 	lbu	t4,6(a1)
 51c:	2598ff80 	addiu	t8,t4,-128
 520:	44982000 	mtc1	t8,$f4
 524:	46802160 	cvt.s.w	$f5,$f4
 528:	e4c500f8 	swc1	$f5,248(a2)
 52c:	90a50007 	lbu	a1,7(a1)
 530:	24a2ff80 	addiu	v0,a1,-128
 534:	44823000 	mtc1	v0,$f6
 538:	468031e0 	cvt.s.w	$f7,$f6
 53c:	03e00008 	jr	ra
 540:	e4c700fc 	swc1	$f7,252(a2)

00000544 <quantize_float>:
 544:	3c1c0000 	lui	gp,0x0
 548:	279c0000 	addiu	gp,gp,0
 54c:	0399e021 	addu	gp,gp,t9
 550:	8f820000 	lw	v0,0(gp)
 554:	24cc0100 	addiu	t4,a2,256
 558:	c4400000 	lwc1	$f0,0(v0)
 55c:	c4c80000 	lwc1	$f8,0(a2)
 560:	c4b00000 	lwc1	$f16,0(a1)
 564:	c4c70004 	lwc1	$f7,4(a2)
 568:	c4af0004 	lwc1	$f15,4(a1)
 56c:	c4c60008 	lwc1	$f6,8(a2)
 570:	c4ae0008 	lwc1	$f14,8(a1)
 574:	c4c5000c 	lwc1	$f5,12(a2)
 578:	c4ad000c 	lwc1	$f13,12(a1)
 57c:	c4c40010 	lwc1	$f4,16(a2)
 580:	c4ac0010 	lwc1	$f12,16(a1)
 584:	c4c30014 	lwc1	$f3,20(a2)
 588:	c4ab0014 	lwc1	$f11,20(a1)
 58c:	c4c20018 	lwc1	$f2,24(a2)
 590:	c4aa0018 	lwc1	$f10,24(a1)
 594:	c4c1001c 	lwc1	$f1,28(a2)
 598:	c4a9001c 	lwc1	$f9,28(a1)
 59c:	4c104460 	madd.s	$f17,$f0,$f8,$f16
 5a0:	4c0f3ca0 	madd.s	$f18,$f0,$f7,$f15
 5a4:	4c0e34e0 	madd.s	$f19,$f0,$f6,$f14
 5a8:	4c0d2c20 	madd.s	$f16,$f0,$f5,$f13
 5ac:	4c0c23e0 	madd.s	$f15,$f0,$f4,$f12
 5b0:	4c0b1ba0 	madd.s	$f14,$f0,$f3,$f11
 5b4:	4c0a1360 	madd.s	$f13,$f0,$f2,$f10
 5b8:	4c090b20 	madd.s	$f12,$f0,$f1,$f9
 5bc:	46008a0d 	trunc.w.s	$f8,$f17
 5c0:	460091cd 	trunc.w.s	$f7,$f18
 5c4:	4600998d 	trunc.w.s	$f6,$f19
 5c8:	4600814d 	trunc.w.s	$f5,$f16
 5cc:	4600790d 	trunc.w.s	$f4,$f15
 5d0:	460070cd 	trunc.w.s	$f3,$f14
 5d4:	46006acd 	trunc.w.s	$f11,$f13
 5d8:	4600608d 	trunc.w.s	$f2,$f12
 5dc:	440d4000 	mfc1	t5,$f8
 5e0:	440b3800 	mfc1	t3,$f7
 5e4:	440a3000 	mfc1	t2,$f6
 5e8:	44092800 	mfc1	t1,$f5
 5ec:	44082000 	mfc1	t0,$f4
 5f0:	44071800 	mfc1	a3,$f3
 5f4:	44035800 	mfc1	v1,$f11
 5f8:	440e1000 	mfc1	t6,$f2
 5fc:	25afc000 	addiu	t7,t5,-16384
 600:	2578c000 	addiu	t8,t3,-16384
 604:	2559c000 	addiu	t9,t2,-16384
 608:	252dc000 	addiu	t5,t1,-16384
 60c:	250bc000 	addiu	t3,t0,-16384
 610:	24eac000 	addiu	t2,a3,-16384
 614:	2469c000 	addiu	t1,v1,-16384
 618:	25c2c000 	addiu	v0,t6,-16384
 61c:	24c60020 	addiu	a2,a2,32
 620:	a48f0000 	sh	t7,0(a0)
 624:	a4980002 	sh	t8,2(a0)
 628:	a4990004 	sh	t9,4(a0)
 62c:	a48d0006 	sh	t5,6(a0)
 630:	a48b0008 	sh	t3,8(a0)
 634:	a48a000a 	sh	t2,10(a0)
 638:	a489000c 	sh	t1,12(a0)
 63c:	a482000e 	sh	v0,14(a0)
 640:	24a50020 	addiu	a1,a1,32
 644:	1586ffc5 	bne	t4,a2,55c <quantize_float+0x18>
 648:	24840010 	addiu	a0,a0,16
 64c:	03e00008 	jr	ra
 650:	00000000 	nop

For comparison, the output of objdump for jsimd_quantize_float_dspr2 from https://github.com/libjpeg-turbo/libjpeg-turbo/blob/master/simd/mips/jsimd_dspr2.S#L2816

00004f6c <jsimd_quantize_float_dspr2>:
    4f6c:	3c094680 	lui	t1,0x4680
    4f70:	35290100 	ori	t1,t1,0x100
    4f74:	44890000 	mtc1	t1,$f0
    4f78:	2408003f 	li	t0,63
    4f7c:	c4c20000 	lwc1	$f2,0(a2)
    4f80:	c4aa0000 	lwc1	$f10,0(a1)
    4f84:	c4c40004 	lwc1	$f4,4(a2)
    4f88:	c4ac0004 	lwc1	$f12,4(a1)
    4f8c:	c4c60008 	lwc1	$f6,8(a2)
    4f90:	c4ae0008 	lwc1	$f14,8(a1)
    4f94:	c4c8000c 	lwc1	$f8,12(a2)
    4f98:	c4b0000c 	lwc1	$f16,12(a1)
    4f9c:	4c0a10a0 	madd.s	$f2,$f0,$f2,$f10
    4fa0:	4c0c2120 	madd.s	$f4,$f0,$f4,$f12
    4fa4:	4c0e31a0 	madd.s	$f6,$f0,$f6,$f14
    4fa8:	4c104220 	madd.s	$f8,$f0,$f8,$f16
    4fac:	c4aa0010 	lwc1	$f10,16(a1)
    4fb0:	c4ac0014 	lwc1	$f12,20(a1)
    4fb4:	4600108d 	trunc.w.s	$f2,$f2
    4fb8:	4600210d 	trunc.w.s	$f4,$f4
    4fbc:	4600318d 	trunc.w.s	$f6,$f6
    4fc0:	4600420d 	trunc.w.s	$f8,$f8
    4fc4:	c4ae0018 	lwc1	$f14,24(a1)
    4fc8:	c4b0001c 	lwc1	$f16,28(a1)
    4fcc:	44091000 	mfc1	t1,$f2
    4fd0:	440a2000 	mfc1	t2,$f4
    4fd4:	440b3000 	mfc1	t3,$f6
    4fd8:	440c4000 	mfc1	t4,$f8
    4fdc:	c4c20010 	lwc1	$f2,16(a2)
    4fe0:	c4c40014 	lwc1	$f4,20(a2)
    4fe4:	c4c60018 	lwc1	$f6,24(a2)
    4fe8:	c4c8001c 	lwc1	$f8,28(a2)
    4fec:	4c0a10a0 	madd.s	$f2,$f0,$f2,$f10
    4ff0:	4c0c2120 	madd.s	$f4,$f0,$f4,$f12
    4ff4:	4c0e31a0 	madd.s	$f6,$f0,$f6,$f14
    4ff8:	4c104220 	madd.s	$f8,$f0,$f8,$f16
    4ffc:	2529c000 	addiu	t1,t1,-16384
    5000:	254ac000 	addiu	t2,t2,-16384
    5008:	258cc000 	addiu	t4,t4,-16384
    500c:	4600108d 	trunc.w.s	$f2,$f2
    5010:	4600210d 	trunc.w.s	$f4,$f4
    5014:	4600318d 	trunc.w.s	$f6,$f6
    5018:	4600420d 	trunc.w.s	$f8,$f8
    501c:	a4890000 	sh	t1,0(a0)
    5020:	a48a0002 	sh	t2,2(a0)
    5024:	a48b0004 	sh	t3,4(a0)
    5028:	a48c0006 	sh	t4,6(a0)
    502c:	44091000 	mfc1	t1,$f2
    5030:	440a2000 	mfc1	t2,$f4
    5034:	440b3000 	mfc1	t3,$f6
    5038:	440c4000 	mfc1	t4,$f8
    503c:	2508fff8 	addiu	t0,t0,-8
    5040:	24c60020 	addiu	a2,a2,32
    5044:	24a50020 	addiu	a1,a1,32
    5048:	2529c000 	addiu	t1,t1,-16384
    504c:	254ac000 	addiu	t2,t2,-16384
    5050:	256bc000 	addiu	t3,t3,-16384
    5054:	258cc000 	addiu	t4,t4,-16384
    5058:	a4890008 	sh	t1,8(a0)
    505c:	a48a000a 	sh	t2,10(a0)
    5060:	a48b000c 	sh	t3,12(a0)
    5064:	a48c000e 	sh	t4,14(a0)
    5068:	0501ffc4 	bgez	t0,4f7c <jsimd_quantize_float_dspr2+0x10>
    506c:	24840010 	addiu	a0,a0,16
    5070:	03e00008 	jr	ra
    5074:	00000000 	nop

The optimized jsimd_quantize_float_dspr2 assembly function contains 67 instructions. GCC 6.5.0 output for quantize_float contains 68 of mostly the same instructions in a slightly different order.

https://sourceforge.net/p/libjpeg-turbo/patches/52/