rvbloom/config.s at main · benmesander/rvbloom · GitHub

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.equ	CPU_BITS,	32
.equ	CPU_BYTES,	CPU_BITS/8
.equ	HAS_ZBB,	0


.macro PUSH reg_to_save, offset_val
.if CPU_BITS == 64
	sd \reg_to_save, \offset_val*CPU_BYTES(sp) # RV64I double word
.else
	sw \reg_to_save, \offset_val*CPU_BYTES(sp) # RV32I word
.endif
.endm

.macro POP reg_to_load, offset_val
.if CPU_BITS == 64
	ld \reg_to_load, \offset_val*CPU_BYTES(sp)
.else
	lw \reg_to_load, \offset_val*CPU_BYTES(sp)
.endif
.endm

.set STACK_ALIGN, 16

.macro FRAME num_regs
    .set BYTES_NEEDED, \num_regs * CPU_BYTES
    .set STACK_SIZE, ((BYTES_NEEDED + STACK_ALIGN - 1) / STACK_ALIGN) * STACK_ALIGN

    # Safety Check: Ensure STACK_SIZE is actually a multiple of 16
    .if (STACK_SIZE % 16) != 0
        .error "Calculated STACK_SIZE is not 16-byte aligned"
    .endif

    addi sp, sp, -STACK_SIZE
.endm

.macro EFRAME num_regs
    .set BYTES_NEEDED, \num_regs * CPU_BYTES
    .set STACK_SIZE, ((BYTES_NEEDED + STACK_ALIGN - 1) / STACK_ALIGN) * STACK_ALIGN

    addi sp, sp, STACK_SIZE
.endm


# Bloom table size - 527 bits (66 bytes)
# 100 items, 1% false positive, 2 hash functions
# https://hur.st/bloomfilter/?n=100&p=0.1&m=&k=2
.equ	BLOOM_TABLE_SIZE,	527
.equ	BLOOM_TABLE_BYTES,	66	# enough bytes to hold 527 bits