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Diffstat (limited to 'sysdeps/alpha/alphaev6/stxncpy.S')
| -rw-r--r-- | sysdeps/alpha/alphaev6/stxncpy.S | 405 |
1 files changed, 405 insertions, 0 deletions
diff --git a/sysdeps/alpha/alphaev6/stxncpy.S b/sysdeps/alpha/alphaev6/stxncpy.S new file mode 100644 index 0000000000..140279106a --- /dev/null +++ b/sysdeps/alpha/alphaev6/stxncpy.S @@ -0,0 +1,405 @@ +/* Copyright (C) 2000 Free Software Foundation, Inc. + Contributed by Richard Henderson (rth@tamu.edu) + EV6 optimized by Rick Gorton <rick.gorton@alpha-processor.com>. + + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +/* Copy no more than COUNT bytes of the null-terminated string from + SRC to DST. + + This is an internal routine used by strncpy, stpncpy, and strncat. + As such, it uses special linkage conventions to make implementation + of these public functions more efficient. + + On input: + t9 = return address + a0 = DST + a1 = SRC + a2 = COUNT + + Furthermore, COUNT may not be zero. + + On output: + t0 = last word written + t8 = bitmask (with one bit set) indicating the last byte written + t10 = bitmask (with one bit set) indicating the byte position of + the end of the range specified by COUNT + a0 = unaligned address of the last *word* written + a2 = the number of full words left in COUNT + + Furthermore, v0, a3-a5, t11, and t12 are untouched. +*/ + +#include <sysdep.h> + + .arch ev6 + .set noat + .set noreorder + +/* There is a problem with either gdb (as of 4.16) or gas (as of 2.7) that + doesn't like putting the entry point for a procedure somewhere in the + middle of the procedure descriptor. Work around this by putting the + aligned copy in its own procedure descriptor */ + + + .ent stxncpy_aligned + .align 4 +stxncpy_aligned: + .frame sp, 0, t9, 0 + .prologue 0 + + /* On entry to this basic block: + t0 == the first destination word for masking back in + t1 == the first source word. */ + + /* Create the 1st output word and detect 0's in the 1st input word. */ + lda t2, -1 # E : build a mask against false zero + mskqh t2, a1, t2 # U : detection in the src word (stall) + mskqh t1, a1, t3 # U : + ornot t1, t2, t2 # E : (stall) + + mskql t0, a1, t0 # U : assemble the first output word + cmpbge zero, t2, t7 # E : bits set iff null found + or t0, t3, t0 # E : (stall) + beq a2, $a_eoc # U : + + bne t7, $a_eos # U : + nop + nop + nop + + /* On entry to this basic block: + t0 == a source word not containing a null. */ + + /* + * nops here to: + * separate store quads from load quads + * limit of 1 bcond/quad to permit training + */ +$a_loop: + stq_u t0, 0(a0) # L : + addq a0, 8, a0 # E : + subq a2, 1, a2 # E : + nop + + ldq_u t0, 0(a1) # L : + addq a1, 8, a1 # E : + cmpbge zero, t0, t7 # E : + beq a2, $a_eoc # U : + + beq t7, $a_loop # U : + nop + nop + nop + + /* Take care of the final (partial) word store. At this point + the end-of-count bit is set in t7 iff it applies. + + On entry to this basic block we have: + t0 == the source word containing the null + t7 == the cmpbge mask that found it. */ + +$a_eos: + negq t7, t8 # E : find low bit set + and t7, t8, t8 # E : (stall) + /* For the sake of the cache, don't read a destination word + if we're not going to need it. */ + and t8, 0x80, t6 # E : (stall) + bne t6, 1f # U : (stall) + + /* We're doing a partial word store and so need to combine + our source and original destination words. */ + ldq_u t1, 0(a0) # L : + subq t8, 1, t6 # E : + or t8, t6, t7 # E : (stall) + zapnot t0, t7, t0 # U : clear src bytes > null (stall) + + zap t1, t7, t1 # .. e1 : clear dst bytes <= null + or t0, t1, t0 # e1 : (stall) + nop + nop + +1: stq_u t0, 0(a0) # L : + ret (t9) # L0 : Latency=3 + nop + nop + + /* Add the end-of-count bit to the eos detection bitmask. */ +$a_eoc: + or t10, t7, t7 # E : + br $a_eos # L0 : Latency=3 + nop + nop + + .end stxncpy_aligned + + .align 4 + .ent __stxncpy + .globl __stxncpy +__stxncpy: + .frame sp, 0, t9, 0 + .prologue 0 + + /* Are source and destination co-aligned? */ + xor a0, a1, t1 # E : + and a0, 7, t0 # E : find dest misalignment + and t1, 7, t1 # E : (stall) + addq a2, t0, a2 # E : bias count by dest misalignment (stall) + + subq a2, 1, a2 # E : + and a2, 7, t2 # E : (stall) + srl a2, 3, a2 # U : a2 = loop counter = (count - 1)/8 (stall) + addq zero, 1, t10 # E : + + sll t10, t2, t10 # U : t10 = bitmask of last count byte + bne t1, $unaligned # U : + /* We are co-aligned; take care of a partial first word. */ + ldq_u t1, 0(a1) # L : load first src word + addq a1, 8, a1 # E : + + beq t0, stxncpy_aligned # U : avoid loading dest word if not needed + ldq_u t0, 0(a0) # L : + nop + nop + + br stxncpy_aligned # .. e1 : + nop + nop + nop + + + +/* The source and destination are not co-aligned. Align the destination + and cope. We have to be very careful about not reading too much and + causing a SEGV. */ + + .align 4 +$u_head: + /* We know just enough now to be able to assemble the first + full source word. We can still find a zero at the end of it + that prevents us from outputting the whole thing. + + On entry to this basic block: + t0 == the first dest word, unmasked + t1 == the shifted low bits of the first source word + t6 == bytemask that is -1 in dest word bytes */ + + ldq_u t2, 8(a1) # L : Latency=3 load second src word + addq a1, 8, a1 # E : + mskql t0, a0, t0 # U : mask trailing garbage in dst + extqh t2, a1, t4 # U : (3 cycle stall on t2) + + or t1, t4, t1 # E : first aligned src word complete (stall) + mskqh t1, a0, t1 # U : mask leading garbage in src (stall) + or t0, t1, t0 # E : first output word complete (stall) + or t0, t6, t6 # E : mask original data for zero test (stall) + + cmpbge zero, t6, t7 # E : + beq a2, $u_eocfin # U : + nop + nop + + bne t7, $u_final # U : + lda t6, -1 # E : mask out the bits we have + mskql t6, a1, t6 # U : already seen (stall) + stq_u t0, 0(a0) # L : store first output word + + or t6, t2, t2 # E : + cmpbge zero, t2, t7 # E : find nulls in second partial (stall) + addq a0, 8, a0 # E : + subq a2, 1, a2 # E : + + bne t7, $u_late_head_exit # U : + /* Finally, we've got all the stupid leading edge cases taken care + of and we can set up to enter the main loop. */ + extql t2, a1, t1 # U : position hi-bits of lo word + ldq_u t2, 8(a1) # L : read next high-order source word + addq a1, 8, a1 # E : + + cmpbge zero, t2, t7 # E : (stall) + beq a2, $u_eoc # U : + nop + nop + + bne t7, $u_eos # e1 : + nop + nop + nop + + /* Unaligned copy main loop. In order to avoid reading too much, + the loop is structured to detect zeros in aligned source words. + This has, unfortunately, effectively pulled half of a loop + iteration out into the head and half into the tail, but it does + prevent nastiness from accumulating in the very thing we want + to run as fast as possible. + + On entry to this basic block: + t1 == the shifted high-order bits from the previous source word + t2 == the unshifted current source word + + We further know that t2 does not contain a null terminator. */ + + .align 4 +$u_loop: + extqh t2, a1, t0 # U : extract high bits for current word + addq a1, 8, a1 # E : + extql t2, a1, t3 # U : extract low bits for next time + addq a0, 8, a0 # E : + + or t0, t1, t0 # E : current dst word now complete + ldq_u t2, 0(a1) # U : Latency=3 load high word for next time + stq_u t0, -8(a0) # U : save the current word (stall) + mov t3, t1 # E : + + subq a2, 1, a2 # E : + cmpbge zero, t2, t7 # E : test new word for eos (2 cycle stall for data) + beq a2, $u_eoc # U : (stall) + nop + + beq t7, $u_loop # U : + nop + nop + nop + + /* We've found a zero somewhere in the source word we just read. + If it resides in the lower half, we have one (probably partial) + word to write out, and if it resides in the upper half, we + have one full and one partial word left to write out. + + On entry to this basic block: + t1 == the shifted high-order bits from the previous source word + t2 == the unshifted current source word. */ +$u_eos: + extqh t2, a1, t0 # U : + or t0, t1, t0 # E : first (partial) source word complete (stall) + cmpbge zero, t0, t7 # E : is the null in this first bit? (stall) + bne t7, $u_final # U : (stall) + + stq_u t0, 0(a0) # L : the null was in the high-order bits + addq a0, 8, a0 # E : + subq a2, 1, a2 # E : + nop + +$u_late_head_exit: + extql t2, a1, t0 # U : + cmpbge zero, t0, t7 # E : + or t7, t10, t6 # E : (stall) + cmoveq a2, t6, t7 # E : Latency=2, extra map slot (stall) + + /* Take care of a final (probably partial) result word. + On entry to this basic block: + t0 == assembled source word + t7 == cmpbge mask that found the null. */ +$u_final: + negq t7, t6 # E : isolate low bit set + and t6, t7, t8 # E : (stall) + and t8, 0x80, t6 # E : avoid dest word load if we can (stall) + bne t6, 1f # U : (stall) + + ldq_u t1, 0(a0) # L : + subq t8, 1, t6 # E : + or t6, t8, t7 # E : (stall) + zapnot t0, t7, t0 # U : kill source bytes > null + + zap t1, t7, t1 # U : kill dest bytes <= null + or t0, t1, t0 # E : (stall) + nop + nop + +1: stq_u t0, 0(a0) # L : + ret (t9) # L0 : Latency=3 + +$u_eoc: # end-of-count + extqh t2, a1, t0 # U : + or t0, t1, t0 # E : (stall) + cmpbge zero, t0, t7 # E : (stall) + nop + +$u_eocfin: # end-of-count, final word + or t10, t7, t7 # E : + br $u_final # L0 : Latency=3 + nop + nop + + /* Unaligned copy entry point. */ + .align 4 +$unaligned: + + ldq_u t1, 0(a1) # L : load first source word + and a0, 7, t4 # E : find dest misalignment + and a1, 7, t5 # E : find src misalignment + /* Conditionally load the first destination word and a bytemask + with 0xff indicating that the destination byte is sacrosanct. */ + mov zero, t0 # E : + + mov zero, t6 # E : + beq t4, 1f # U : + ldq_u t0, 0(a0) # L : + lda t6, -1 # E : + + mskql t6, a0, t6 # U : + nop + nop + nop +1: + subq a1, t4, a1 # E : sub dest misalignment from src addr + + /* If source misalignment is larger than dest misalignment, we need + extra startup checks to avoid SEGV. */ + + cmplt t4, t5, t8 # E : + extql t1, a1, t1 # U : shift src into place + lda t2, -1 # E : for creating masks later + beq t8, $u_head # U : (stall) + + mskqh t2, t5, t2 # U : begin src byte validity mask + cmpbge zero, t1, t7 # E : is there a zero? + extql t2, a1, t2 # U : + or t7, t10, t5 # E : test for end-of-count too + + cmpbge zero, t2, t3 # E : + cmoveq a2, t5, t7 # E : Latency=2, extra map slot + nop # E : keep with cmoveq + andnot t7, t3, t7 # E : (stall) + + beq t7, $u_head # U : + /* At this point we've found a zero in the first partial word of + the source. We need to isolate the valid source data and mask + it into the original destination data. (Incidentally, we know + that we'll need at least one byte of that original dest word.) */ + ldq_u t0, 0(a0) # L : + negq t7, t6 # E : build bitmask of bytes <= zero + mskqh t1, t4, t1 # U : + + and t6, t7, t8 # E : + subq t8, 1, t6 # E : (stall) + or t6, t8, t7 # E : (stall) + zapnot t2, t7, t2 # U : prepare source word; mirror changes (stall) + + zapnot t1, t7, t1 # U : to source validity mask + andnot t0, t2, t0 # E : zero place for source to reside + or t0, t1, t0 # E : and put it there (stall both t0, t1) + stq_u t0, 0(a0) # L : (stall) + + ret (t9) # L0 : Latency=3 + nop + nop + nop + + .end __stxncpy + |