diff options
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/alpha/alphaev6/stxcpy.S | 78 |
1 files changed, 39 insertions, 39 deletions
diff --git a/sysdeps/alpha/alphaev6/stxcpy.S b/sysdeps/alpha/alphaev6/stxcpy.S index 0df2043..39d731d 100644 --- a/sysdeps/alpha/alphaev6/stxcpy.S +++ b/sysdeps/alpha/alphaev6/stxcpy.S @@ -68,9 +68,9 @@ stxcpy_aligned: ornot t1, t2, t2 # E : (stall) mskql t0, a1, t0 # U : assemble the first output word - cmpbge zero, t2, t8 # E : bits set iff null found + cmpbge zero, t2, t10 # E : bits set iff null found or t0, t3, t1 # E : (stall) - bne t8, $a_eos # U : (stall) + bne t10, $a_eos # U : (stall) /* On entry to this basic block: t0 == the first destination word for masking back in @@ -85,29 +85,29 @@ $a_loop: ldq_u t1, 0(a1) # L : Latency=3 addq a1, 8, a1 # E : - cmpbge zero, t1, t8 # E : (3 cycle stall) - beq t8, $a_loop # U : (stall for t8) + cmpbge zero, t1, t10 # E : (3 cycle stall) + beq t10, $a_loop # U : (stall for t10) /* Take care of the final (partial) word store. On entry to this basic block we have: t1 == the source word containing the null - t8 == the cmpbge mask that found it. */ + t10 == the cmpbge mask that found it. */ $a_eos: - negq t8, t6 # E : find low bit set - and t8, t6, t10 # E : (stall) + negq t10, t6 # E : find low bit set + and t10, t6, t8 # E : (stall) /* For the sake of the cache, don't read a destination word if we're not going to need it. */ - and t10, 0x80, t6 # E : (stall) + 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 t0, 0(a0) # L : Latency=3 - subq t10, 1, t6 # E : + subq t8, 1, t6 # E : zapnot t1, t6, t1 # U : clear src bytes >= null (stall) - or t10, t6, t8 # E : (stall) + or t8, t6, t10 # E : (stall) - zap t0, t8, t0 # E : clear dst bytes <= null + zap t0, t10, t0 # E : clear dst bytes <= null or t0, t1, t1 # E : (stall) nop nop @@ -170,14 +170,14 @@ $u_head: or t0, t1, t1 # E : (stall on t1) or t1, t6, t6 # E : - cmpbge zero, t6, t8 # E : (stall) + cmpbge zero, t6, t10 # E : (stall) lda t6, -1 # E : for masking just below - bne t8, $u_final # U : (stall) + bne t10, $u_final # U : (stall) mskql t6, a1, t6 # U : mask out the bits we have or t6, t2, t2 # E : already extracted before (stall) - cmpbge zero, t2, t8 # E : testing eos (stall) - bne t8, $u_late_head_exit # U : (stall) + cmpbge zero, t2, t10 # E : testing eos (stall) + bne t10, $u_late_head_exit # U : (stall) /* Finally, we've got all the stupid leading edge cases taken care of and we can set up to enter the main loop. */ @@ -188,9 +188,9 @@ $u_head: ldq_u t2, 8(a1) # U : read next high-order source word addq a1, 8, a1 # E : - cmpbge zero, t2, t8 # E : (stall for t2) + cmpbge zero, t2, t10 # E : (stall for t2) nop # E : - bne t8, $u_eos # U : (stall) + bne t10, $u_eos # U : (stall) /* Unaligned copy main loop. In order to avoid reading too much, the loop is structured to detect zeros in aligned source words. @@ -217,8 +217,8 @@ $u_loop: stq_u t1, -8(a0) # L : save the current word (stall) mov t3, t0 # E : - cmpbge zero, t2, t8 # E : test new word for eos - beq t8, $u_loop # U : (stall) + cmpbge zero, t2, t10 # E : test new word for eos + beq t10, $u_loop # U : (stall) nop nop @@ -233,31 +233,31 @@ $u_loop: $u_eos: extqh t2, a1, t1 # U : or t0, t1, t1 # E : first (partial) source word complete (stall) - cmpbge zero, t1, t8 # E : is the null in this first bit? (stall) - bne t8, $u_final # U : (stall) + cmpbge zero, t1, t10 # E : is the null in this first bit? (stall) + bne t10, $u_final # U : (stall) $u_late_head_exit: stq_u t1, 0(a0) # L : the null was in the high-order bits addq a0, 8, a0 # E : extql t2, a1, t1 # U : - cmpbge zero, t1, t8 # E : (stall) + cmpbge zero, t1, t10 # E : (stall) /* Take care of a final (probably partial) result word. On entry to this basic block: t1 == assembled source word - t8 == cmpbge mask that found the null. */ + t10 == cmpbge mask that found the null. */ $u_final: - negq t8, t6 # E : isolate low bit set - and t6, t8, t10 # E : (stall) - and t10, 0x80, t6 # E : avoid dest word load if we can (stall) + negq t10, t6 # E : isolate low bit set + and t6, t10, t8 # E : (stall) + and t8, 0x80, t6 # E : avoid dest word load if we can (stall) bne t6, 1f # U : (stall) ldq_u t0, 0(a0) # E : - subq t10, 1, t6 # E : - or t6, t10, t8 # E : (stall) + subq t8, 1, t6 # E : + or t6, t8, t10 # E : (stall) zapnot t1, t6, t1 # U : kill source bytes >= null (stall) - zap t0, t8, t0 # U : kill dest bytes <= null (2 cycle data stall) + zap t0, t10, t0 # U : kill dest bytes <= null (2 cycle data stall) or t0, t1, t1 # E : (stall) nop nop @@ -291,14 +291,14 @@ $unaligned: 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, t10 # E : - beq t10, $u_head # U : + cmplt t4, t5, t8 # E : + beq t8, $u_head # U : lda t2, -1 # E : mask out leading garbage in source mskqh t2, t5, t2 # U : ornot t1, t2, t3 # E : (stall) - cmpbge zero, t3, t8 # E : is there a zero? (stall) - beq t8, $u_head # U : (stall) + cmpbge zero, t3, t10 # E : is there a zero? (stall) + beq t10, $u_head # U : (stall) /* 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 @@ -306,14 +306,14 @@ $unaligned: that we'll need at least one byte of that original dest word.) */ ldq_u t0, 0(a0) # L : - negq t8, t6 # E : build bitmask of bytes <= zero - and t6, t8, t10 # E : (stall) + negq t10, t6 # E : build bitmask of bytes <= zero + and t6, t10, t8 # E : (stall) and a1, 7, t5 # E : - subq t10, 1, t6 # E : - or t6, t10, t8 # E : (stall) - srl t10, t5, t10 # U : adjust final null return value - zapnot t2, t8, t2 # U : prepare source word; mirror changes (stall) + subq t8, 1, t6 # E : + or t6, t8, t10 # E : (stall) + srl t8, t5, t8 # U : adjust final null return value + zapnot t2, t10, t2 # U : prepare source word; mirror changes (stall) and t1, t2, t1 # E : to source validity mask extql t2, a1, t2 # U : |