78 lines
2.0 KiB
Zig
78 lines
2.0 KiB
Zig
const builtin = @import("builtin");
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pub extern stdcallcc fn _allrem(a: i64, b: i64) i64 {
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@setRuntimeSafety(builtin.is_test);
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const s_a = a >> (i64.bit_count - 1);
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const s_b = b >> (i64.bit_count - 1);
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const an = (a ^ s_a) -% s_a;
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const bn = (b ^ s_b) -% s_b;
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const r = @bitCast(u64, an) % @bitCast(u64, bn);
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const s = s_a ^ s_b;
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return (@bitCast(i64, r) ^ s) -% s;
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}
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pub nakedcc fn _aullrem() void {
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@setRuntimeSafety(false);
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// The stack layout is:
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// ESP+16 divisor (hi)
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// ESP+12 divisor (low)
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// ESP+8 dividend (hi)
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// ESP+4 dividend (low)
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// ESP return address
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asm volatile (
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\\ push %%ebx
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\\ mov 0x14(%%esp),%%eax
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\\ or %%eax,%%eax
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\\ jne 1f
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\\ mov 0x10(%%esp),%%ecx
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\\ mov 0xc(%%esp),%%eax
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\\ xor %%edx,%%edx
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\\ div %%ecx
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\\ mov 0x8(%%esp),%%eax
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\\ div %%ecx
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\\ mov %%edx,%%eax
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\\ xor %%edx,%%edx
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\\ jmp 6f
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\\ 1:
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\\ mov %%eax,%%ecx
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\\ mov 0x10(%%esp),%%ebx
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\\ mov 0xc(%%esp),%%edx
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\\ mov 0x8(%%esp),%%eax
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\\ 2:
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\\ shr %%ecx
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\\ rcr %%ebx
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\\ shr %%edx
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\\ rcr %%eax
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\\ or %%ecx,%%ecx
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\\ jne 2b
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\\ div %%ebx
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\\ mov %%eax,%%ecx
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\\ mull 0x14(%%esp)
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\\ xchg %%eax,%%ecx
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\\ mull 0x10(%%esp)
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\\ add %%ecx,%%edx
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\\ jb 3f
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\\ cmp 0xc(%%esp),%%edx
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\\ ja 3f
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\\ jb 4f
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\\ cmp 0x8(%%esp),%%eax
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\\ jbe 4f
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\\ 3:
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\\ sub 0x10(%%esp),%%eax
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\\ sbb 0x14(%%esp),%%edx
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\\ 4:
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\\ sub 0x8(%%esp),%%eax
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\\ sbb 0xc(%%esp),%%edx
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\\ neg %%edx
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\\ neg %%eax
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\\ sbb $0x0,%%edx
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\\ 6:
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\\ pop %%ebx
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\\ ret $0x10
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);
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}
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