--- /dev/null
+dnl PowerPC-32/VMX and PowerPC-64/VMX mpn_popcount.
+
+dnl Copyright 2006 Free Software Foundation, Inc.
+
+dnl This file is part of the GNU MP Library.
+
+dnl The GNU MP Library is free software; you can redistribute it and/or modify
+dnl it under the terms of the GNU Lesser General Public License as published
+dnl by the Free Software Foundation; either version 3 of the License, or (at
+dnl your option) any later version.
+
+dnl The GNU MP Library is distributed in the hope that it will be useful, but
+dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+dnl License for more details.
+
+dnl You should have received a copy of the GNU Lesser General Public License
+dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/.
+
+include(`../config.m4')
+
+C cycles/limb
+C 7400,7410 (G4): 2.75
+C 744x,745x (G4+): 2.25
+C 970 (G5): 5.3
+
+C STATUS
+C * Works for all sizes and alignments.
+
+C TODO
+C * Tune the awkward huge n outer loop code.
+C * Two lvx, two vperm, and two vxor could make us a similar hamdist.
+C * For the 970, a combined VMX+intop approach might be best.
+C * Compress cnsts table in 64-bit mode, only half the values are needed.
+
+define(`GMP_LIMB_BYTES', eval(GMP_LIMB_BITS/8))
+define(`LIMBS_PER_VR', eval(16/GMP_LIMB_BYTES))
+define(`LIMBS_PER_2VR', eval(32/GMP_LIMB_BYTES))
+
+define(`OPERATION_popcount')
+
+ifdef(`OPERATION_popcount',`
+ define(`func',`mpn_popcount')
+ define(`up', `r3')
+ define(`n', `r4')
+ define(`HAM', `dnl')
+')
+ifdef(`OPERATION_hamdist',`
+ define(`func',`mpn_hamdist')
+ define(`up', `r3')
+ define(`vp', `r4')
+ define(`n', `r5')
+ define(`HAM', `$1')
+')
+
+define(`x01010101',`v2')
+define(`x00110011',`v7')
+define(`x00001111',`v10')
+define(`cnt1',`v11')
+define(`cnt2',`v12')
+define(`cnt4',`v13')
+
+ifelse(GMP_LIMB_BITS,32,`
+ define(`LIMB32',` $1')
+ define(`LIMB64',`')
+',`
+ define(`LIMB32',`')
+ define(`LIMB64',` $1')
+')
+
+C The inner loop handles up to 2^34 bits, i.e., 2^31 64-limbs, due to overflow
+C in vsum4ubs. For large operands, we work in chunks, of size LIMBS_PER_CHUNK.
+define(`LIMBS_PER_CHUNK', 0x1000)
+define(`LIMBS_CHUNK_THRES', 0x1001)
+
+ASM_START()
+PROLOGUE(mpn_popcount)
+ mfspr r10, 256
+ oris r0, r10, 0xfffc C Set VRSAVE bit 0-13
+ mtspr 256, r0
+
+ifdef(`HAVE_ABI_mode32',
+` rldicl n, n, 0, 32') C zero extend n
+
+C Load various constants into vector registers
+ LEAL( r11, cnsts)
+ li r12, 16
+ vspltisb cnt1, 1 C 0x0101...01 used as shift count
+ vspltisb cnt2, 2 C 0x0202...02 used as shift count
+ vspltisb cnt4, 4 C 0x0404...04 used as shift count
+ lvx x01010101, 0, r11 C 0x3333...33
+ lvx x00110011, r12, r11 C 0x5555...55
+ vspltisb x00001111, 15 C 0x0f0f...0f
+
+LIMB64(`lis r0, LIMBS_CHUNK_THRES ')
+LIMB64(`cmpd cr7, n, r0 ')
+
+ lvx v0, 0, up
+ addi r7, r11, 96
+ rlwinm r6, up, 2,26,29
+ lvx v8, r7, r6
+ vand v0, v0, v8
+
+LIMB32(`rlwinm r8, up, 30,30,31 ')
+LIMB64(`rlwinm r8, up, 29,31,31 ')
+ add n, n, r8 C compensate n for rounded down `up'
+
+ vxor v1, v1, v1
+ li r8, 0 C grand total count
+
+ vxor v3, v3, v3 C zero total count
+
+ addic. n, n, -LIMBS_PER_VR
+ ble L(sum)
+
+ addic. n, n, -LIMBS_PER_VR
+ ble L(lsum)
+
+C For 64-bit machines, handle huge n that would overflow vsum4ubs
+LIMB64(`ble cr7, L(small) ')
+LIMB64(`addis r9, n, -LIMBS_PER_CHUNK ') C remaining n
+LIMB64(`lis n, LIMBS_PER_CHUNK ')
+L(small):
+
+
+LIMB32(`srwi r7, n, 3 ') C loop count corresponding to n
+LIMB64(`srdi r7, n, 2 ') C loop count corresponding to n
+ addi r7, r7, 1
+ mtctr r7 C copy n to count register
+ b L(ent)
+
+ ALIGN(8)
+L(top): lvx v0, 0, up
+ li r7, 128 C prefetch distance
+L(ent): lvx v1, r12, up
+ addi up, up, 32
+ vsr v4, v0, cnt1
+ vsr v5, v1, cnt1
+ dcbt up, r7 C prefetch
+ vand v8, v4, x01010101
+ vand v9, v5, x01010101
+ vsububm v0, v0, v8 C 64 2-bit accumulators (0..2)
+ vsububm v1, v1, v9 C 64 2-bit accumulators (0..2)
+ vsr v4, v0, cnt2
+ vsr v5, v1, cnt2
+ vand v8, v0, x00110011
+ vand v9, v1, x00110011
+ vand v4, v4, x00110011
+ vand v5, v5, x00110011
+ vaddubm v0, v4, v8 C 32 4-bit accumulators (0..4)
+ vaddubm v1, v5, v9 C 32 4-bit accumulators (0..4)
+ vaddubm v8, v0, v1 C 32 4-bit accumulators (0..8)
+ vsr v9, v8, cnt4
+ vand v6, v8, x00001111
+ vand v9, v9, x00001111
+ vaddubm v6, v9, v6 C 16 8-bit accumulators (0..16)
+ vsum4ubs v3, v6, v3 C sum 4 x 4 bytes into 4 32-bit fields
+ bdnz L(top)
+
+ andi. n, n, eval(LIMBS_PER_2VR-1)
+ beq L(rt)
+
+ lvx v0, 0, up
+ vxor v1, v1, v1
+ cmpwi n, LIMBS_PER_VR
+ ble L(sum)
+L(lsum):
+ vor v1, v0, v0
+ lvx v0, r12, up
+L(sum):
+LIMB32(`rlwinm r6, n, 4,26,27 ')
+LIMB64(`rlwinm r6, n, 5,26,26 ')
+ addi r7, r11, 32
+ lvx v8, r7, r6
+ vand v0, v0, v8
+
+ vsr v4, v0, cnt1
+ vsr v5, v1, cnt1
+ vand v8, v4, x01010101
+ vand v9, v5, x01010101
+ vsububm v0, v0, v8 C 64 2-bit accumulators (0..2)
+ vsububm v1, v1, v9 C 64 2-bit accumulators (0..2)
+ vsr v4, v0, cnt2
+ vsr v5, v1, cnt2
+ vand v8, v0, x00110011
+ vand v9, v1, x00110011
+ vand v4, v4, x00110011
+ vand v5, v5, x00110011
+ vaddubm v0, v4, v8 C 32 4-bit accumulators (0..4)
+ vaddubm v1, v5, v9 C 32 4-bit accumulators (0..4)
+ vaddubm v8, v0, v1 C 32 4-bit accumulators (0..8)
+ vsr v9, v8, cnt4
+ vand v6, v8, x00001111
+ vand v9, v9, x00001111
+ vaddubm v6, v9, v6 C 16 8-bit accumulators (0..16)
+ vsum4ubs v3, v6, v3 C sum 4 x 4 bytes into 4 32-bit fields
+
+L(rt):
+ li r7, -16 C FIXME: does all ppc32 and ppc64 ABIs
+ stvx v3, r7, r1 C FIXME: ...support storing below sp?
+
+ lwz r7, -16(r1)
+ add r8, r8, r7
+ lwz r7, -12(r1)
+ add r8, r8, r7
+ lwz r7, -8(r1)
+ add r8, r8, r7
+ lwz r7, -4(r1)
+ add r8, r8, r7
+
+C Handle outer loop for huge n. We inherit cr7 and r0 from above.
+LIMB64(`ble cr7, L(ret)
+ vxor v3, v3, v3 C zero total count
+ mr n, r9
+ cmpd cr7, n, r0
+ ble cr7, L(2)
+ addis r9, n, -LIMBS_PER_CHUNK C remaining n
+ lis n, LIMBS_PER_CHUNK
+L(2): srdi r7, n, 2 C loop count corresponding to n
+ mtctr r7 C copy n to count register
+ b L(top)
+')
+
+L(ret): mr r3, r8
+ mtspr 256, r10
+ blr
+EPILOGUE()
+
+DEF_OBJECT(cnsts,16)
+ .byte 0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55
+ .byte 0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55
+
+ .byte 0x33,0x33,0x33,0x33,0x33,0x33,0x33,0x33
+ .byte 0x33,0x33,0x33,0x33,0x33,0x33,0x33,0x33
+C Masks for high end of number
+ .byte 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff
+ .byte 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff
+
+ .byte 0xff,0xff,0xff,0xff,0x00,0x00,0x00,0x00
+ .byte 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
+
+ .byte 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff
+ .byte 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
+
+ .byte 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff
+ .byte 0xff,0xff,0xff,0xff,0x00,0x00,0x00,0x00
+C Masks for low end of number
+ .byte 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff
+ .byte 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff
+
+ .byte 0x00,0x00,0x00,0x00,0xff,0xff,0xff,0xff
+ .byte 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff
+
+ .byte 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
+ .byte 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff
+
+ .byte 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
+ .byte 0x00,0x00,0x00,0x00,0xff,0xff,0xff,0xff
+END_OBJECT(cnsts)
+ASM_END()
projects / msp430-gcc.git / blobdiff