mirror of
https://codeberg.org/ziglang/zig.git
synced 2026-03-08 02:44:43 +01:00
74608293af
use the "symbol" helper function in all exports move all declarations from common.zig to compiler_rt.zig flatten the tree structure somewhat (move contents of tiny files into parent files) No functional changes.
86 lines
2.2 KiB
Zig
86 lines
2.2 KiB
Zig
const builtin = @import("builtin");
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const compiler_rt = @import("../compiler_rt.zig");
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const symbol = @import("../compiler_rt.zig").symbol;
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comptime {
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if (compiler_rt.want_windows_x86_msvc_abi) {
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// Don't let LLVM apply the stdcall name mangling on those MSVC builtins
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symbol(&_alldiv, "\x01__alldiv");
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symbol(&_aulldiv, "\x01__aulldiv");
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}
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}
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pub fn _alldiv(a: i64, b: i64) callconv(.{ .x86_stdcall = .{} }) i64 {
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const s_a = a >> (64 - 1);
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const s_b = b >> (64 - 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 = @as(u64, @bitCast(an)) / @as(u64, @bitCast(bn));
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const s = s_a ^ s_b;
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return (@as(i64, @bitCast(r)) ^ s) -% s;
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}
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pub fn _aulldiv() callconv(.naked) 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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\\ push %%esi
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\\ mov 0x18(%%esp),%%eax
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\\ or %%eax,%%eax
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\\ jne 1f
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\\ mov 0x14(%%esp),%%ecx
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\\ mov 0x10(%%esp),%%eax
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\\ xor %%edx,%%edx
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\\ div %%ecx
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\\ mov %%eax,%%ebx
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\\ mov 0xc(%%esp),%%eax
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\\ div %%ecx
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\\ mov %%ebx,%%edx
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\\ jmp 5f
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\\ 1:
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\\ mov %%eax,%%ecx
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\\ mov 0x14(%%esp),%%ebx
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\\ mov 0x10(%%esp),%%edx
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\\ mov 0xc(%%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,%%esi
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\\ mull 0x18(%%esp)
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\\ mov %%eax,%%ecx
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\\ mov 0x14(%%esp),%%eax
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\\ mul %%esi
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\\ add %%ecx,%%edx
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\\ jb 3f
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\\ cmp 0x10(%%esp),%%edx
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\\ ja 3f
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\\ jb 4f
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\\ cmp 0xc(%%esp),%%eax
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\\ jbe 4f
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\\ 3:
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\\ dec %%esi
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\\ 4:
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\\ xor %%edx,%%edx
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\\ mov %%esi,%%eax
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\\ 5:
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\\ pop %%esi
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\\ pop %%ebx
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\\ ret $0x10
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);
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}
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