8605a2fcfc
This provides and, ior, xor, com, zer, set, cms when defined($1) and ior, set when !defined($1). I don't provide the other operations !defined($1) because our Modula-2 compiler hasn't used them. I wrote a Modula-2 example in https://gist.github.com/kernigh/add79662bb3c63ffb7c46d01dc8ae788 Put a dummy comment in mach/powerpc/libem/build.lua so git checkout will touch that file. Without the touch, the build system doesn't see the new *.s files.
32 lines
704 B
ArmAsm
32 lines
704 B
ArmAsm
#include "powerpc.h"
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.sect .text
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! Compare sets a, b.
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! Stack: ( b a -- )
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! With r3 = size of each set
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! Yields r3 = 0 if equal, nonzero if not equal
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.define .cms
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.cms:
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mr r4, sp ! r4 = ptr to set a
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add r5, sp, r3 ! r5 = ptr to set b
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mr r6, r3 ! r6 = size
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rlwinm r3, r3, 30, 2, 31
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mtspr ctr, r3 ! ctr = size / 4
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1:
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lwz r7, 0(r4)
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lwz r8, 0(r5)
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cmp cr0, 0, r7, r8 ! compare words in sets
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addi r4, r4, 4
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addi r5, r5, 4
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bc IFFALSE, EQ, 2f ! branch if not equal
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bc DNZ, 0, 1b ! loop ctr times
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addi r3, r0, 0 ! equal: return 0
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b 3f
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2:
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addi r3, r0, 1 ! not equal: return 1
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3:
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rlwinm r6, r6, 1, 0, 30 ! r6 = size * 2
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add sp, sp, r6 ! remove sets from stack
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bclr ALWAYS, 0, 0
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