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runtime: optimise memclrNoHeapPointers on riscv64
Implement a more optimised memclrNoHeapPointers on riscv64, where up to 64 bytes are zeroed per loop after achieving alignment. name old time/op new time/op delta Memclr/5-4 53.1ns _ 0% 37.0ns _ 4% -30.37% (p=0.002 n=3+3) Memclr/16-4 42.3ns _ 0% 34.8ns _ 0% -17.81% (p=0.000 n=3+3) Memclr/64-4 67.8ns _ 0% 44.0ns _ 1% -35.09% (p=0.000 n=3+3) Memclr/256-4 185ns _ 0% 78ns _ 1% -57.52% (p=0.000 n=3+3) Memclr/4096-4 2.50_s _ 1% 0.76_s _ 1% -69.72% (p=0.000 n=3+3) Memclr/65536-4 55.6_s _ 0% 31.4_s _ 0% -43.56% (p=0.000 n=3+3) Memclr/1M-4 1.15ms _ 0% 0.72ms _ 1% -37.14% (p=0.000 n=3+3) Memclr/4M-4 12.1ms _ 3% 10.1ms _ 0% -16.51% (p=0.007 n=3+3) Memclr/8M-4 25.2ms _ 1% 21.5ms _ 0% -14.75% (p=0.001 n=3+3) Memclr/16M-4 52.8ms _ 5% 43.4ms _ 0% -17.95% (p=0.019 n=3+3) Memclr/64M-4 202ms _ 1% 173ms _ 0% -14.42% (p=0.001 n=3+3) MemclrRange/1K_2K-4 54.0_s _ 1% 22.0_s _ 0% -59.26% (p=0.000 n=3+3) MemclrRange/2K_8K-4 176_s _ 1% 64_s _ 1% -63.77% (p=0.000 n=3+3) MemclrRange/4K_16K-4 172_s _ 6% 60_s _ 0% -65.38% (p=0.002 n=3+3) MemclrRange/160K_228K-4 1.54ms _ 1% 0.91ms _ 0% -40.60% (p=0.000 n=3+3) name old speed new speed delta Memclr/5-4 94.1MB/s _ 0% 135.3MB/s _ 4% +43.70% (p=0.004 n=3+3) Memclr/16-4 378MB/s _ 0% 460MB/s _ 0% +21.67% (p=0.000 n=3+3) Memclr/64-4 943MB/s _ 0% 1454MB/s _ 1% +54.07% (p=0.000 n=3+3) Memclr/256-4 1.39GB/s _ 0% 3.26GB/s _ 1% +135.38% (p=0.000 n=3+3) Memclr/4096-4 1.64GB/s _ 1% 5.41GB/s _ 1% +230.28% (p=0.000 n=3+3) Memclr/65536-4 1.18GB/s _ 0% 2.09GB/s _ 0% +77.19% (p=0.000 n=3+3) Memclr/1M-4 914MB/s _ 0% 1454MB/s _ 1% +59.08% (p=0.000 n=3+3) Memclr/4M-4 346MB/s _ 3% 415MB/s _ 0% +19.73% (p=0.004 n=3+3) Memclr/8M-4 332MB/s _ 1% 390MB/s _ 0% +17.29% (p=0.000 n=3+3) Memclr/16M-4 318MB/s _ 5% 387MB/s _ 0% +21.72% (p=0.013 n=3+3) Memclr/64M-4 333MB/s _ 1% 389MB/s _ 0% +16.84% (p=0.001 n=3+3) MemclrRange/1K_2K-4 1.78GB/s _ 1% 4.36GB/s _ 0% +145.48% (p=0.000 n=3+3) MemclrRange/2K_8K-4 1.89GB/s _ 1% 5.22GB/s _ 1% +176.03% (p=0.000 n=3+3) MemclrRange/4K_16K-4 1.88GB/s _ 5% 5.42GB/s _ 0% +188.40% (p=0.000 n=3+3) MemclrRange/160K_228K-4 1.08GB/s _ 1% 1.82GB/s _ 0% +68.35% (p=0.000 n=3+3) Change-Id: Ide566f148f890f70217ed08fd472ee5893d3511c Reviewed-on: https://go-review.googlesource.com/c/go/+/426255 Reviewed-by: Michael Knyszek <mknyszek@google.com> Run-TryBot: Joel Sing <joel@sing.id.au> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Meng Zhuo <mzh@golangcn.org> Reviewed-by: Cherry Mui <cherryyz@google.com>
This commit is contained in:
Joel Sing
parent
5231ba2f05
commit
44ad662a49
@ -9,40 +9,97 @@
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// void runtime·memclrNoHeapPointers(void*, uintptr)
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TEXT runtime·memclrNoHeapPointers<ABIInternal>(SB),NOSPLIT,$0-16
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#ifndef GOEXPERIMENT_regabiargs
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MOV ptr+0(FP), A0
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MOV n+8(FP), A1
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MOV ptr+0(FP), X10
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MOV n+8(FP), X11
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#endif
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ADD A0, A1, T4
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// If less than eight bytes, do one byte at a time.
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SLTU $8, A1, T3
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BNE T3, ZERO, outcheck
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// If less than 8 bytes, do single byte zeroing.
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MOV $8, X9
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BLT X11, X9, check4
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// Do one byte at a time until eight-aligned.
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JMP aligncheck
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// Check alignment
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AND $3, X10, X5
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BEQZ X5, aligned
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// Zero one byte at a time until we reach 8 byte alignment.
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SUB X5, X11, X11
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align:
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MOVB ZERO, (A0)
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ADD $1, A0
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aligncheck:
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AND $7, A0, T3
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BNE T3, ZERO, align
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ADD $-1, X5
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MOVB ZERO, 0(X10)
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ADD $1, X10
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BNEZ X5, align
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// Do eight bytes at a time as long as there is room.
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ADD $-7, T4, T5
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JMP wordscheck
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words:
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MOV ZERO, (A0)
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ADD $8, A0
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wordscheck:
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SLTU T5, A0, T3
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BNE T3, ZERO, words
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aligned:
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MOV $8, X9
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BLT X11, X9, check4
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MOV $16, X9
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BLT X11, X9, zero8
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MOV $32, X9
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BLT X11, X9, zero16
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MOV $64, X9
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BLT X11, X9, zero32
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loop64:
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MOV ZERO, 0(X10)
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MOV ZERO, 8(X10)
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MOV ZERO, 16(X10)
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MOV ZERO, 24(X10)
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MOV ZERO, 32(X10)
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MOV ZERO, 40(X10)
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MOV ZERO, 48(X10)
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MOV ZERO, 56(X10)
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ADD $64, X10
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ADD $-64, X11
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BGE X11, X9, loop64
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BEQZ X11, done
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JMP outcheck
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out:
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MOVB ZERO, (A0)
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ADD $1, A0
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outcheck:
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BNE A0, T4, out
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check32:
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MOV $32, X9
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BLT X11, X9, check16
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zero32:
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MOV ZERO, 0(X10)
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MOV ZERO, 8(X10)
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MOV ZERO, 16(X10)
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MOV ZERO, 24(X10)
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ADD $32, X10
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ADD $-32, X11
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BEQZ X11, done
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check16:
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MOV $16, X9
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BLT X11, X9, check8
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zero16:
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MOV ZERO, 0(X10)
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MOV ZERO, 8(X10)
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ADD $16, X10
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ADD $-16, X11
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BEQZ X11, done
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check8:
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MOV $8, X9
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BLT X11, X9, check4
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zero8:
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MOV ZERO, 0(X10)
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ADD $8, X10
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ADD $-8, X11
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BEQZ X11, done
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check4:
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MOV $4, X9
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BLT X11, X9, loop1
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zero4:
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MOVB ZERO, 0(X10)
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MOVB ZERO, 1(X10)
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MOVB ZERO, 2(X10)
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MOVB ZERO, 3(X10)
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ADD $4, X10
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ADD $-4, X11
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loop1:
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BEQZ X11, done
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MOVB ZERO, 0(X10)
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ADD $1, X10
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ADD $-1, X11
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JMP loop1
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done:
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RET
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