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Combined prefetch + read into a single step

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tevador
2019-01-07 11:26:43 +01:00
parent 4189e4ebc6
commit 6519fed4d1
2 changed files with 28 additions and 20 deletions
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src/executeProgram-win64.asm
+17 -20
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@@ -223,17 +223,12 @@ ReadMemoryRandom MACRO spmask, float
;# GLOBAL rbp = "ic" number of instructions until the end of the program
;# GLOBAL rbx = address of the dataset address
;# GLOBAL rsi = address of the scratchpad
;# GLOBAL rdi = "mx" random 32-bit dataset address
;# GLOBAL rdi = low 32 bits = "mx", high 32 bits = "ma"
;# MODIFY rcx, rdx
LOCAL L_prefetch, L_read, L_return
mov eax, ebp
and al, 63
jz short L_prefetch ;# "ic" divisible by 64 -> prefetch
xor edx, edx
cmp al, 14
je short L_read ;# "ic" = 14 (mod 64) -> random read
cmovb edx, ecx ;# "ic" < 14 (mod 64) -> modify random read address
xor edi, edx
LOCAL L_prefetch_read, L_return
test ebp, 63
jz short L_prefetch_read ;# "ic" divisible by 64 -> prefetch + read
xor rdi, rcx ;# randomize "mx"
L_return:
and ecx, spmask ;# limit address to the specified scratchpad size
IF float
@@ -242,12 +237,15 @@ ELSE
mov rax, qword ptr [rsi+rcx*8]
ENDIF
ret
L_prefetch:
L_prefetch_read:
; prefetch cacheline "mx"
mov rax, qword ptr [rbx] ;# load the dataset address
and edi, -64 ;# align "mx" to the start of a cache line
prefetchnta byte ptr [rax+rdi]
jmp short L_return
L_read:
and rdi, -64 ;# align "mx" to the start of a cache line
mov edx, edi ;# edx = mx
prefetchnta byte ptr [rax+rdx]
; read cacheline "ma"
ror rdi, 32 ;# swap "ma" and "mx"
mov edx, edi ;# edx = ma
push rcx
TransformAddress ecx, rcx ;# TransformAddress function
and ecx, spmask-7 ;# limit address to the specified scratchpad size aligned to multiple of 8
@@ -274,14 +272,13 @@ ReadMemoryRandom 32767, 1
ALIGN 64
rx_read_dataset:
;# IN rcx = scratchpad index - must be divisible by 8
;# GLOBAL rbx = address of the dataset address
;# IN rax = dataset address
;# IN ecx = scratchpad index - must be divisible by 8
;# IN edx = dataset index - must be divisible by 64
;# GLOBAL rsi = address of the scratchpad
;# GLOBAL rdi = "mx" random 32-bit dataset address
;# MODIFY rax, rcx, rdx
mov rax, qword ptr [rbx] ;# load the dataset address
lea rcx, [rsi+rcx*8] ;# scratchpad cache line
lea rax, [rax+rdi] ;# dataset cache line
lea rax, [rax+rdx] ;# dataset cache line
mov rdx, qword ptr [rax+0] ;# load first dataset quadword (prefetched into the cache by now)
xor qword ptr [rcx+0], rdx ;# XOR the dataset item with a scratchpad item, repeat for the rest of the cacheline
mov rdx, qword ptr [rax+8]