// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build !math_big_pure_go,ppc64 !math_big_pure_go,ppc64le
#include "textflag.h"
// This file provides fast assembly versions for the elementary
// arithmetic operations on vectors implemented in arith.go.
// func mulWW(x, y Word) (z1, z0 Word)
TEXT ·mulWW(SB), NOSPLIT, $0
MOVD x+0(FP), R4
MOVD y+8(FP), R5
MULHDU R4, R5, R6
MULLD R4, R5, R7
MOVD R6, z1+16(FP)
MOVD R7, z0+24(FP)
RET
// func addVV(z, y, y []Word) (c Word)
// z[i] = x[i] + y[i] for all i, carrying
TEXT ·addVV(SB), NOSPLIT, $0
MOVD z_len+8(FP), R7 // R7 = z_len
MOVD x+24(FP), R8 // R8 = x[]
MOVD y+48(FP), R9 // R9 = y[]
MOVD z+0(FP), R10 // R10 = z[]
// If z_len = 0, we are done
CMP R0, R7
MOVD R0, R4
BEQ done
// Process the first iteration out of the loop so we can
// use MOVDU and avoid 3 index registers updates.
MOVD 0(R8), R11 // R11 = x[i]
MOVD 0(R9), R12 // R12 = y[i]
ADD $-1, R7 // R7 = z_len - 1
ADDC R12, R11, R15 // R15 = x[i] + y[i], set CA
CMP R0, R7
MOVD R15, 0(R10) // z[i]
BEQ final // If z_len was 1, we are done
SRD $2, R7, R5 // R5 = z_len/4
CMP R0, R5
MOVD R5, CTR // Set up loop counter
BEQ tail // If R5 = 0, we can't use the loop
// Process 4 elements per iteration. Unrolling this loop
// means a performance trade-off: we will lose performance
// for small values of z_len (0.90x in the worst case), but
// gain significant performance as z_len increases (up to
// 1.45x).
loop:
MOVD 8(R8), R11 // R11 = x[i]
MOVD 16(R8), R12 // R12 = x[i+1]
MOVD 24(R8), R14 // R14 = x[i+2]
MOVDU 32(R8), R15 // R15 = x[i+3]
MOVD 8(R9), R16 // R16 = y[i]
MOVD 16(R9), R17 // R17 = y[i+1]
MOVD 24(R9), R18 // R18 = y[i+2]
MOVDU 32(R9), R19 // R19 = y[i+3]
ADDE R11, R16, R20 // R20 = x[i] + y[i] + CA
ADDE R12, R17, R21 // R21 = x[i+1] + y[i+1] + CA
ADDE R14, R18, R22 // R22 = x[i+2] + y[i+2] + CA
ADDE R15, R19, R23 // R23 = x[i+3] + y[i+3] + CA
MOVD R20, 8(R10) // z[i]
MOVD R21, 16(R10) // z[i+1]
MOVD R22, 24(R10) // z[i+2]
MOVDU R23, 32(R10) // z[i+3]
ADD $-4, R7 // R7 = z_len - 4
BC 16, 0, loop // bdnz
// We may have more elements to read
CMP R0, R7
BEQ final
// Process the remaining elements, one at a time
tail:
MOVDU 8(R8), R11 // R11 = x[i]
MOVDU 8(R9), R16 // R16 = y[i]
ADD $-1, R7 // R7 = z_len - 1
ADDE R11, R16, R20 // R20 = x[i] + y[i] + CA
CMP R0, R7
MOVDU R20, 8(R10) // z[i]
BEQ final // If R7 = 0, we are done
MOVDU 8(R8), R11
MOVDU 8(R9), R16
ADD $-1, R7
ADDE R11, R16, R20
CMP R0, R7
MOVDU R20, 8(R10)
BEQ final
MOVD 8(R8), R11
MOVD 8(R9), R16
ADDE R11, R16, R20
MOVD R20, 8(R10)
final:
ADDZE R4 // Capture CA
done:
MOVD R4, c+72(FP)
RET
// func subVV(z, x, y []Word) (c Word)
// z[i] = x[i] - y[i] for all i, carrying
TEXT ·subVV(SB), NOSPLIT, $0
MOVD z_len+8(FP), R7 // R7 = z_len
MOVD x+24(FP), R8 // R8 = x[]
MOVD y+48(FP), R9 // R9 = y[]
MOVD z+0(FP), R10 // R10 = z[]
// If z_len = 0, we are done
CMP R0, R7
MOVD R0, R4
BEQ done
// Process the first iteration out of the loop so we can
// use MOVDU and avoid 3 index registers updates.
MOVD 0(R8), R11 // R11 = x[i]
MOVD 0(R9), R12 // R12 = y[i]
ADD $-1, R7 // R7 = z_len - 1
SUBC R12, R11, R15 // R15 = x[i] - y[i], set CA
CMP R0, R7
MOVD R15, 0(R10) // z[i]
BEQ final // If z_len was 1, we are done
SRD $2, R7, R5 // R5 = z_len/4
CMP R0, R5
MOVD R5, CTR // Set up loop counter
BEQ tail // If R5 = 0, we can't use the loop
// Process 4 elements per iteration. Unrolling this loop
// means a performance trade-off: we will lose performance
// for small values of z_len (0.92x in the worst case), but
// gain significant performance as z_len increases (up to
// 1.45x).
loop:
MOVD 8(R8), R11 // R11 = x[i]
MOVD 16(R8), R12 // R12 = x[i+1]
MOVD 24(R8), R14 // R14 = x[i+2]
MOVDU 32(R8), R15 // R15 = x[i+3]
MOVD 8(R9), R16 // R16 = y[i]
MOVD 16(R9), R17 // R17 = y[i+1]
MOVD 24(R9), R18 // R18 = y[i+2]
MOVDU 32(R9), R19 // R19 = y[i+3]
SUBE R16, R11, R20 // R20 = x[i] - y[i] + CA
SUBE R17, R12, R21 // R21 = x[i+1] - y[i+1] + CA
SUBE R18, R14, R22 // R22 = x[i+2] - y[i+2] + CA
SUBE R19, R15, R23 // R23 = x[i+3] - y[i+3] + CA
MOVD R20, 8(R10) // z[i]
MOVD R21, 16(R10) // z[i+1]
MOVD R22, 24(R10) // z[i+2]
MOVDU R23, 32(R10) // z[i+3]
ADD $-4, R7 // R7 = z_len - 4
BC 16, 0, loop // bdnz
// We may have more elements to read
CMP R0, R7
BEQ final
// Process the remaining elements, one at a time
tail:
MOVDU 8(R8), R11 // R11 = x[i]
MOVDU 8(R9), R16 // R16 = y[i]
ADD $-1, R7 // R7 = z_len - 1
SUBE R16, R11, R20 // R20 = x[i] - y[i] + CA
CMP R0, R7
MOVDU R20, 8(R10) // z[i]
BEQ final // If R7 = 0, we are done
MOVDU 8(R8), R11
MOVDU 8(R9), R16
ADD $-1, R7
SUBE R16, R11, R20
CMP R0, R7
MOVDU R20, 8(R10)
BEQ final
MOVD 8(R8), R11
MOVD 8(R9), R16
SUBE R16, R11, R20
MOVD R20, 8(R10)
final:
ADDZE R4
XOR $1, R4
done:
MOVD R4, c+72(FP)
RET
// func addVW(z, x []Word, y Word) (c Word)
TEXT ·addVW(SB), NOSPLIT, $0
MOVD z+0(FP), R10 // R10 = z[]
MOVD x+24(FP), R8 // R8 = x[]
MOVD y+48(FP), R4 // R4 = y = c
MOVD z_len+8(FP), R11 // R11 = z_len
CMP R0, R11 // If z_len is zero, return
BEQ done
// We will process the first iteration out of the loop so we capture
// the value of c. In the subsequent iterations, we will rely on the
// value of CA set here.
MOVD 0(R8), R20 // R20 = x[i]
ADD $-1, R11 // R11 = z_len - 1
ADDC R20, R4, R6 // R6 = x[i] + c
CMP R0, R11 // If z_len was 1, we are done
MOVD R6, 0(R10) // z[i]
BEQ final
// We will read 4 elements per iteration
SRD $2, R11, R9 // R9 = z_len/4
DCBT (R8)
CMP R0, R9
MOVD R9, CTR // Set up the loop counter
BEQ tail // If R9 = 0, we can't use the loop
loop:
MOVD 8(R8), R20 // R20 = x[i]
MOVD 16(R8), R21 // R21 = x[i+1]
MOVD 24(R8), R22 // R22 = x[i+2]
MOVDU 32(R8), R23 // R23 = x[i+3]
ADDZE R20, R24 // R24 = x[i] + CA
ADDZE R21, R25 // R25 = x[i+1] + CA
ADDZE R22, R26 // R26 = x[i+2] + CA
ADDZE R23, R27 // R27 = x[i+3] + CA
MOVD R24, 8(R10) // z[i]
MOVD R25, 16(R10) // z[i+1]
MOVD R26, 24(R10) // z[i+2]
MOVDU R27, 32(R10) // z[i+3]
ADD $-4, R11 // R11 = z_len - 4
BC 16, 0, loop // bdnz
// We may have some elements to read
CMP R0, R11
BEQ final
tail:
MOVDU 8(R8), R20
ADDZE R20, R24
ADD $-1, R11
MOVDU R24, 8(R10)
CMP R0, R11
BEQ final
MOVDU 8(R8), R20
ADDZE R20, R24
ADD $-1, R11
MOVDU R24, 8(R10)
CMP R0, R11
BEQ final
MOVD 8(R8), R20
ADDZE R20, R24
MOVD R24, 8(R10)
final:
ADDZE R0, R4 // c = CA
done:
MOVD R4, c+56(FP)
RET
// func subVW(z, x []Word, y Word) (c Word)
TEXT ·subVW(SB), NOSPLIT, $0
MOVD z+0(FP), R10 // R10 = z[]
MOVD x+24(FP), R8 // R8 = x[]
MOVD y+48(FP), R4 // R4 = y = c
MOVD z_len+8(FP), R11 // R11 = z_len
CMP R0, R11 // If z_len is zero, return
BEQ done
// We will process the first iteration out of the loop so we capture
// the value of c. In the subsequent iterations, we will rely on the
// value of CA set here.
MOVD 0(R8), R20 // R20 = x[i]
ADD $-1, R11 // R11 = z_len - 1
SUBC R4, R20, R6 // R6 = x[i] - c
CMP R0, R11 // If z_len was 1, we are done
MOVD R6, 0(R10) // z[i]
BEQ final
// We will read 4 elements per iteration
SRD $2, R11, R9 // R9 = z_len/4
DCBT (R8)
CMP R0, R9
MOVD R9, CTR // Set up the loop counter
BEQ tail // If R9 = 0, we can't use the loop
// The loop here is almost the same as the one used in s390x, but
// we don't need to capture CA every iteration because we've already
// done that above.
loop:
MOVD 8(R8), R20
MOVD 16(R8), R21
MOVD 24(R8), R22
MOVDU 32(R8), R23
SUBE R0, R20
SUBE R0, R21
SUBE R0, R22
SUBE R0, R23
MOVD R20, 8(R10)
MOVD R21, 16(R10)
MOVD R22, 24(R10)
MOVDU R23, 32(R10)
ADD $-4, R11
BC 16, 0, loop // bdnz
// We may have some elements to read
CMP R0, R11
BEQ final
tail:
MOVDU 8(R8), R20
SUBE R0, R20
ADD $-1, R11
MOVDU R20, 8(R10)
CMP R0, R11
BEQ final
MOVDU 8(R8), R20
SUBE R0, R20
ADD $-1, R11
MOVDU R20, 8(R10)
CMP R0, R11
BEQ final
MOVD 8(R8), R20
SUBE R0, R20
MOVD R20, 8(R10)
final:
// Capture CA
SUBE R4, R4
NEG R4, R4
done:
MOVD R4, c+56(FP)
RET
TEXT ·shlVU(SB), NOSPLIT, $0
BR ·shlVU_g(SB)
TEXT ·shrVU(SB), NOSPLIT, $0
BR ·shrVU_g(SB)
// func mulAddVWW(z, x []Word, y, r Word) (c Word)
TEXT ·mulAddVWW(SB), NOSPLIT, $0
MOVD z+0(FP), R10 // R10 = z[]
MOVD x+24(FP), R8 // R8 = x[]
MOVD y+48(FP), R9 // R9 = y
MOVD r+56(FP), R4 // R4 = r = c
MOVD z_len+8(FP), R11 // R11 = z_len
CMP R0, R11
BEQ done
MOVD 0(R8), R20
ADD $-1, R11
MULLD R9, R20, R6 // R6 = z0 = Low-order(x[i]*y)
MULHDU R9, R20, R7 // R7 = z1 = High-order(x[i]*y)
ADDC R4, R6 // R6 = z0 + r
ADDZE R7 // R7 = z1 + CA
CMP R0, R11
MOVD R7, R4 // R4 = c
MOVD R6, 0(R10) // z[i]
BEQ done
// We will read 4 elements per iteration
SRD $2, R11, R14 // R14 = z_len/4
DCBT (R8)
CMP R0, R14
MOVD R14, CTR // Set up the loop counter
BEQ tail // If R9 = 0, we can't use the loop
loop:
MOVD 8(R8), R20 // R20 = x[i]
MOVD 16(R8), R21 // R21 = x[i+1]
MOVD 24(R8), R22 // R22 = x[i+2]
MOVDU 32(R8), R23 // R23 = x[i+3]
MULLD R9, R20, R24 // R24 = z0[i]
MULHDU R9, R20, R20 // R20 = z1[i]
ADDC R4, R24 // R24 = z0[i] + c
ADDZE R20 // R7 = z1[i] + CA
MULLD R9, R21, R25
MULHDU R9, R21, R21
ADDC R20, R25
ADDZE R21
MULLD R9, R22, R26
MULHDU R9, R22, R22
ADDC R21, R26
ADDZE R22
MULLD R9, R23, R27
MULHDU R9, R23, R23
ADDC R22, R27
ADDZE R23
MOVD R24, 8(R10) // z[i]
MOVD R25, 16(R10) // z[i+1]
MOVD R26, 24(R10) // z[i+2]
MOVDU R27, 32(R10) // z[i+3]
MOVD R23, R4 // R4 = c
ADD $-4, R11 // R11 = z_len - 4
BC 16, 0, loop // bdnz
// We may have some elements to read
CMP R0, R11
BEQ done
// Process the remaining elements, one at a time
tail:
MOVDU 8(R8), R20 // R20 = x[i]
MULLD R9, R20, R24 // R24 = z0[i]
MULHDU R9, R20, R25 // R25 = z1[i]
ADD $-1, R11 // R11 = z_len - 1
ADDC R4, R24
ADDZE R25
MOVDU R24, 8(R10) // z[i]
CMP R0, R11
MOVD R25, R4 // R4 = c
BEQ done // If R11 = 0, we are done
MOVDU 8(R8), R20
MULLD R9, R20, R24
MULHDU R9, R20, R25
ADD $-1, R11
ADDC R4, R24
ADDZE R25
MOVDU R24, 8(R10)
CMP R0, R11
MOVD R25, R4
BEQ done
MOVD 8(R8), R20
MULLD R9, R20, R24
MULHDU R9, R20, R25
ADD $-1, R11
ADDC R4, R24
ADDZE R25
MOVD R24, 8(R10)
MOVD R25, R4
done:
MOVD R4, c+64(FP)
RET
// func addMulVVW(z, x []Word, y Word) (c Word)
TEXT ·addMulVVW(SB), NOSPLIT, $0
MOVD z+0(FP), R10 // R10 = z[]
MOVD x+24(FP), R8 // R8 = x[]
MOVD y+48(FP), R9 // R9 = y
MOVD z_len+8(FP), R22 // R22 = z_len
MOVD R0, R3 // R3 will be the index register
CMP R0, R22
MOVD R0, R4 // R4 = c = 0
MOVD R22, CTR // Initialize loop counter
BEQ done
loop:
MOVD (R8)(R3), R20 // Load x[i]
MOVD (R10)(R3), R21 // Load z[i]
MULLD R9, R20, R6 // R6 = Low-order(x[i]*y)
MULHDU R9, R20, R7 // R7 = High-order(x[i]*y)
ADDC R21, R6 // R6 = z0
ADDZE R7 // R7 = z1
ADDC R4, R6 // R6 = z0 + c + 0
ADDZE R7, R4 // c += z1
MOVD R6, (R10)(R3) // Store z[i]
ADD $8, R3
BC 16, 0, loop // bdnz
done:
MOVD R4, c+56(FP)
RET
// func divWW(x1, x0, y Word) (q, r Word)
TEXT ·divWW(SB), NOSPLIT, $0
MOVD x1+0(FP), R4
MOVD x0+8(FP), R5
MOVD y+16(FP), R6
CMPU R4, R6
BGE divbigger
// from the programmer's note in ch. 3 of the ISA manual, p.74
DIVDEU R6, R4, R3
DIVDU R6, R5, R7
MULLD R6, R3, R8
MULLD R6, R7, R20
SUB R20, R5, R10
ADD R7, R3, R3
SUB R8, R10, R4
CMPU R4, R10
BLT adjust
CMPU R4, R6
BLT end
adjust:
MOVD $1, R21
ADD R21, R3, R3
SUB R6, R4, R4
end:
MOVD R3, q+24(FP)
MOVD R4, r+32(FP)
RET
divbigger:
MOVD $-1, R7
MOVD R7, q+24(FP)
MOVD R7, r+32(FP)
RET
TEXT ·divWVW(SB), NOSPLIT, $0
BR ·divWVW_g(SB)
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