032bcffef6
The new features are the hi16/lo16 and ha16/lo16 syntax for relocations, and the extended mnemonics like "blr". Use ha16/lo16 to load some double floats with 2 instructions (lis/lfd) instead of 3 (lis/ori/lfd). Use the extended names for branches, comparisons, and bit rotations, so I can more easily read the code. The new names often encode the same machine instructions as the old names, except in a few places where I changed the instructions. Stop using andi. when we don't need to set cr0. In inn.s, I change andi. to extrwi to extract the same bits. In los.s and sts.s, I change "andi. r3, r3, ~3" to "clrrwi r3, r3, 2". This avoids setting cr0 and also stops clearing the high 16 bits of r3. In csa.s, los.s, sts.s, I change some comparisons and right shifts from signed to unsigned (cmplw, cmplwi, srwi), because the sizes are unsigned. In inn.s, the right shift can be signed (sraw) or unsigned (srw), but I use srw because we don't need the carry bit. In fef8.s, I save an instruction by using rlwinm instead of addis/andc to rlwinm to clear a field. The code no longer kills r7. In both fef8.s and fif8.s, I remove the list of killed registers. Also remove some whitespace from ends of lines.
30 lines
553 B
ArmAsm
30 lines
553 B
ArmAsm
.sect .text
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! Create singleton set.
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! Stack: ( bitnumber size -- set )
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.define .set
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.set:
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lwz r3, 0 (sp)
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lwz r4, 4 (sp)
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addi sp, sp, 8
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srwi r7, r3, 2
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neg r5, r3
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add sp, sp, r5 ! allocate set
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mr r6, sp ! r6 = ptr to set
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mtspr ctr, r7 ! ctr = r3 / 4
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1:
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clrrwi. r7, r4, 5 ! r7 = r4 & ~31
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beq 2f ! branch if r4 in 0..31
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li r5, 0 ! no bit, word is zero
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b 3f
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2:
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li r5, 1
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slw r5, r5, r4 ! yes bit, set bit in word
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3:
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stw r5, 0(r6) ! store word in set
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addi r4, r4, -32
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addi r6, r6, 4
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bdnz 1b ! loop ctr times
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blr
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