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polarssl: add ARM DSP optimized mpi_montsqr

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Aurelien Jarno 2017-10-12 22:02:23 +02:00 committed by NIIBE Yutaka
parent 8319f4a14b
commit 3bb5097031
1 changed files with 46 additions and 0 deletions
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46
polarssl/library/bignum.c
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@ -1537,6 +1537,51 @@ static void mpi_montsqr( size_t n, const t_uint *np, t_uint mm, t_uint *d )
x_i = *xj;
*xj++ = c;
#if defined(__ARM_FEATURE_DSP)
asm (/* (C,R4,R5) := w_i_i + x_i*x_i; w_i_i := R5; */
"mov %[c], #0\n\t"
"ldr r5, [%[wij]]\n\t" /* R5 := w_i_i; */
"mov r4, %[c]\n\t"
"umlal r5, r4, %[x_i], %[x_i]\n\t"
"str r5, [%[wij]], #4\n\t"
"cmp %[xj], %[x_max1]\n\t"
"bhi 0f\n\t"
"mov r9, %[c]\n\t" /* R9 := 0, the constant ZERO from here. */
"beq 1f\n"
"2:\n\t"
"ldmia %[xj]!, { r7, r8 }\n\t"
"ldmia %[wij], { r5, r6 }\n\t"
/* (C,R4,R5) := (C,R4) + w_i_j + 2*x_i*x_j; */
"umaal r5, r4, %[x_i], r7\n\t"
"umlal r5, %[c], %[x_i], r7\n\t"
"umaal r4, %[c], r9, r9\n\t"
/* (C,R4,R6) := (C,R4) + w_i_j + 2*x_i*x_j; */
"umaal r6, r4, %[x_i], r8\n\t"
"umlal r6, %[c], %[x_i], r8\n\t"
"umaal r4, %[c], r9, r9\n\t"
/**/
"stmia %[wij]!, { r5, r6 }\n\t"
"cmp %[xj], %[x_max1]\n\t"
"bcc 2b\n\t"
"bne 0f\n"
"1:\n\t"
/* (C,R4,R5) := (C,R4) + w_i_j + 2*x_i*x_j; */
"ldr r5, [%[wij]]\n\t"
"ldr r6, [%[xj]], #4\n\t"
"umaal r5, r4, %[x_i], r6\n\t"
"umlal r5, %[c], %[x_i], r6\n\t"
"umaal r4, %[c], r9, r9\n\t"
"str r5, [%[wij]], #4\n"
"0:\n\t"
"ldr r5, [%[wij]]\n\t"
"adds r4, r4, r5\n\t"
"adc %[c], %[c], #0\n\t"
"str r4, [%[wij]]"
: [c] "=&r" (c), [wij] "=r" (wij), [xj] "=r" (xj)
: [x_i] "r" (x_i), [x_max1] "r" (&d[n*2-1]),
"[wij]" (wij), "[xj]" (xj)
: "r4", "r5", "r6", "r7", "r8", "r9", "memory", "cc");
#else
asm (/* (C,R4,R5) := w_i_i + x_i*x_i; w_i_i := R5; */
"mov %[c], #0\n\t"
"ldr r5, [%[wij]]\n\t" /* R5 := w_i_i; */
@ -1598,6 +1643,7 @@ static void mpi_montsqr( size_t n, const t_uint *np, t_uint mm, t_uint *d )
: [x_i] "r" (x_i), [x_max1] "r" (&d[n*2-1]),
"[wij]" (wij), "[xj]" (xj)
: "r4", "r5", "r6", "r7", "r8", "r9", "r12", "memory", "cc");
#endif
c += mpi_mul_hlp( n, np, &d[i], d[i] * mm );
}