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stage2-wasm: introduce __u?(div|mod)ei5, revert prev approach

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Co-authored-by: Jacob Young <jacobly0@users.noreply.github.com>
This commit is contained in:
Pavel Verigo
2026-04-08 16:47:23 +02:00
parent 07e3e50fd2
commit ed9b0655f7
4 changed files with 105 additions and 35 deletions
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lib/compiler_rt/divmodei4.zig
+43 -27
View File
@@ -10,45 +10,39 @@ const symbol = @import("../compiler_rt.zig").symbol;
comptime {
symbol(&__divei4, "__divei4");
symbol(&__modei4, "__modei4");
symbol(&__divei5, "__divei5");
symbol(&__modei5, "__modei5");
}
inline fn limb(x: []u32, i: usize) *u32 {
return if (endian == .little) &x[i] else &x[x.len - 1 - i];
inline fn limb(i: usize, len: usize) usize {
return if (endian == .little) i else len - 1 - i;
}
inline fn neg(x: []u32) void {
inline fn neg(out: []u32, in: []const u32) void {
var ov: u1 = 1;
for (0..x.len) |limb_index| {
const l = limb(x, limb_index);
l.*, ov = @addWithOverflow(~l.*, ov);
for (0..in.len) |limb_index| {
const new, ov = @addWithOverflow(~in[limb(limb_index, in.len)], ov);
out[limb(limb_index, out.len)] = new;
}
}
const max_limbs = std.math.divCeil(usize, 65535, 32) catch unreachable;
fn divmod(q: ?[]u32, r: ?[]u32, u: []const u32, v: []const u32) !void {
const u_sign: i32 = @bitCast(u[u.len - 1]);
const v_sign: i32 = @bitCast(v[v.len - 1]);
var ua: [max_limbs]u32 = undefined;
const us = ua[0..u.len];
@memcpy(us, u);
var va: [max_limbs]u32 = undefined;
const vs = va[0..v.len];
@memcpy(vs, v);
if (u_sign < 0) neg(us);
if (v_sign < 0) neg(vs);
try @call(.always_inline, udivmod, .{ q, r, us, vs });
if (q) |x| if (u_sign ^ v_sign < 0) neg(x);
if (r) |x| if (u_sign < 0) neg(x);
fn divmod(q: ?[]u32, r: ?[]u32, u: []const u32, v: []const u32, tu: []u32, tv: []u32) !void {
const u_sign: i32 = @bitCast(u[limb(u.len - 1, u.len)]);
const v_sign: i32 = @bitCast(v[limb(v.len - 1, v.len)]);
if (u_sign < 0) neg(tu, u);
if (v_sign < 0) neg(tv, v);
try @call(.always_inline, udivmod, .{ q, r, if (u_sign < 0) tu else u, if (v_sign < 0) tv else v });
if (q) |x| if (u_sign ^ v_sign < 0) neg(x, x);
if (r) |x| if (u_sign < 0) neg(x, x);
}
pub fn __divei4(q_p: [*]u8, u_p: [*]const u8, v_p: [*]const u8, bits: usize) callconv(.c) void {
pub fn __divei4(q_p: [*]u8, u_p: [*]u8, v_p: [*]u8, bits: usize) callconv(.c) void {
@setRuntimeSafety(compiler_rt.test_safety);
const byte_size = std.zig.target.intByteSize(&builtin.target, @intCast(bits));
const q: []u32 = @ptrCast(@alignCast(q_p[0..byte_size]));
const u: []const u32 = @ptrCast(@alignCast(u_p[0..byte_size]));
const v: []const u32 = @ptrCast(@alignCast(v_p[0..byte_size]));
@call(.always_inline, divmod, .{ q, null, u, v }) catch unreachable;
const u: []u32 = @ptrCast(@alignCast(u_p[0..byte_size]));
const v: []u32 = @ptrCast(@alignCast(v_p[0..byte_size]));
@call(.always_inline, divmod, .{ q, null, u, v, u, v }) catch unreachable;
}
pub fn __modei4(r_p: [*]u8, u_p: [*]u8, v_p: [*]u8, bits: usize) callconv(.c) void {
@@ -57,5 +51,27 @@ pub fn __modei4(r_p: [*]u8, u_p: [*]u8, v_p: [*]u8, bits: usize) callconv(.c) vo
const r: []u32 = @ptrCast(@alignCast(r_p[0..byte_size]));
const u: []u32 = @ptrCast(@alignCast(u_p[0..byte_size]));
const v: []u32 = @ptrCast(@alignCast(v_p[0..byte_size]));
@call(.always_inline, divmod, .{ null, r, u, v }) catch unreachable;
@call(.always_inline, divmod, .{ null, r, u, v, u, v }) catch unreachable;
}
pub fn __divei5(q_p: [*]u8, u_p: [*]const u8, v_p: [*]const u8, t_p: [*]u8, bits: usize) callconv(.c) void {
@setRuntimeSafety(compiler_rt.test_safety);
const byte_size = std.zig.target.intByteSize(&builtin.target, @intCast(bits));
const q: []u32 = @ptrCast(@alignCast(q_p[0..byte_size]));
const u: []const u32 = @ptrCast(@alignCast(u_p[0..byte_size]));
const v: []const u32 = @ptrCast(@alignCast(v_p[0..byte_size]));
const tu: []u32 = @ptrCast(@alignCast(t_p[0..byte_size]));
const tv: []u32 = @ptrCast(@alignCast(t_p[byte_size..][0..byte_size]));
@call(.always_inline, divmod, .{ q, null, u, v, tu, tv }) catch unreachable;
}
pub fn __modei5(r_p: [*]u8, u_p: [*]const u8, v_p: [*]const u8, t_p: [*]u8, bits: usize) callconv(.c) void {
@setRuntimeSafety(compiler_rt.test_safety);
const byte_size = std.zig.target.intByteSize(&builtin.target, @intCast(bits));
const r: []u32 = @ptrCast(@alignCast(r_p[0..byte_size]));
const u: []const u32 = @ptrCast(@alignCast(u_p[0..byte_size]));
const v: []const u32 = @ptrCast(@alignCast(v_p[0..byte_size]));
const tu: []u32 = @ptrCast(@alignCast(t_p[0..byte_size]));
const tv: []u32 = @ptrCast(@alignCast(t_p[byte_size..][0..byte_size]));
@call(.always_inline, divmod, .{ null, r, u, v, tu, tv }) catch unreachable;
}
lib/compiler_rt/udivmodei4.zig
+28
View File
@@ -13,6 +13,8 @@ const max_limbs = std.math.divCeil(usize, 65535, 32) catch unreachable; // max s
comptime {
symbol(&__udivei4, "__udivei4");
symbol(&__umodei4, "__umodei4");
symbol(&__udivei5, "__udivei5");
symbol(&__umodei5, "__umodei5");
}
/// Get the value of a limb.
@@ -132,6 +134,32 @@ pub fn __umodei4(r_p: [*]u8, u_p: [*]const u8, v_p: [*]const u8, bits: usize) ca
@call(.always_inline, divmod, .{ null, r, u, v }) catch unreachable;
}
pub fn __udivei5(q_p: [*]u8, u_p: [*]const u8, v_p: [*]const u8, t_p: [*]u8, bits: usize) callconv(.c) void {
@setRuntimeSafety(compiler_rt.test_safety);
const byte_size = std.zig.target.intByteSize(&builtin.target, @intCast(bits));
const q: []u32 = @ptrCast(@alignCast(q_p[0..byte_size]));
const u: []const u32 = @ptrCast(@alignCast(u_p[0..byte_size]));
const v: []const u32 = @ptrCast(@alignCast(v_p[0..byte_size]));
const tu: []u32 = @ptrCast(@alignCast(t_p[0..byte_size]));
_ = tu;
const tv: []u32 = @ptrCast(@alignCast(t_p[byte_size..][0..byte_size]));
_ = tv;
@call(.always_inline, divmod, .{ q, null, u, v }) catch unreachable;
}
pub fn __umodei5(r_p: [*]u8, u_p: [*]const u8, v_p: [*]const u8, t_p: [*]u8, bits: usize) callconv(.c) void {
@setRuntimeSafety(compiler_rt.test_safety);
const byte_size = std.zig.target.intByteSize(&builtin.target, @intCast(bits));
const r: []u32 = @ptrCast(@alignCast(r_p[0..byte_size]));
const u: []const u32 = @ptrCast(@alignCast(u_p[0..byte_size]));
const v: []const u32 = @ptrCast(@alignCast(v_p[0..byte_size]));
const tu: []u32 = @ptrCast(@alignCast(t_p[0..byte_size]));
_ = tu;
const tv: []u32 = @ptrCast(@alignCast(t_p[byte_size..][0..byte_size]));
_ = tv;
@call(.always_inline, divmod, .{ null, r, u, v }) catch unreachable;
}
test "__udivei4/__umodei4" {
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_c) return error.SkipZigTest;
src/codegen/wasm/CodeGen.zig
+30 -4
View File
@@ -2530,11 +2530,24 @@ fn intDiv(cg: *CodeGen, ty: IntType, lhs: WValue, rhs: WValue) InnerError!WValue
},
else => {
const result = try cg.allocInt(ty);
const bits = cg.intBackingBits(ty.bits);
var tmp = try cg.allocInt(.{ .is_signed = false, .bits = bits * 2 });
if (ty.is_signed) {
_ = try cg.callIntrinsic(.__divei4, &.{ .usize_type, .usize_type, .usize_type, .usize_type }, .void, &.{ result, lhs, rhs, .{ .imm32 = ty.bits } });
_ = try cg.callIntrinsic(
.__divei5,
&.{ .usize_type, .usize_type, .usize_type, .usize_type, .usize_type },
.void,
&.{ result, lhs, rhs, tmp, .{ .imm32 = ty.bits } },
);
} else {
_ = try cg.callIntrinsic(.__udivei4, &.{ .usize_type, .usize_type, .usize_type, .usize_type }, .void, &.{ result, lhs, rhs, .{ .imm32 = ty.bits } });
_ = try cg.callIntrinsic(
.__udivei5,
&.{ .usize_type, .usize_type, .usize_type, .usize_type, .usize_type },
.void,
&.{ result, lhs, rhs, tmp, .{ .imm32 = ty.bits } },
);
}
tmp.free(cg);
return result;
},
}
@@ -2631,11 +2644,24 @@ fn intRem(cg: *CodeGen, ty: IntType, lhs: WValue, rhs: WValue) InnerError!WValue
},
else => {
const result = try cg.allocInt(ty);
const bits = cg.intBackingBits(ty.bits);
var tmp = try cg.allocInt(.{ .is_signed = false, .bits = bits * 2 });
if (ty.is_signed) {
_ = try cg.callIntrinsic(.__modei4, &.{ .usize_type, .usize_type, .usize_type, .usize_type }, .void, &.{ result, lhs, rhs, .{ .imm32 = ty.bits } });
_ = try cg.callIntrinsic(
.__modei5,
&.{ .usize_type, .usize_type, .usize_type, .usize_type, .usize_type },
.void,
&.{ result, lhs, rhs, tmp, .{ .imm32 = ty.bits } },
);
} else {
_ = try cg.callIntrinsic(.__umodei4, &.{ .usize_type, .usize_type, .usize_type, .usize_type }, .void, &.{ result, lhs, rhs, .{ .imm32 = ty.bits } });
_ = try cg.callIntrinsic(
.__umodei5,
&.{ .usize_type, .usize_type, .usize_type, .usize_type, .usize_type },
.void,
&.{ result, lhs, rhs, tmp, .{ .imm32 = ty.bits } },
);
}
tmp.free(cg);
return result;
},
}
src/codegen/wasm/Mir.zig
+4 -4
View File
@@ -825,7 +825,7 @@ pub const Intrinsic = enum(u32) {
__ceilx,
__cosh,
__cosx,
__divei4,
__divei5,
__divhf3,
__divtf3,
__divti3,
@@ -951,7 +951,7 @@ pub const Intrinsic = enum(u32) {
__lshrti3,
__lttf2,
__ltxf2,
__modei4,
__modei5,
__modti3,
__mulhf3,
__mulodi4,
@@ -982,9 +982,9 @@ pub const Intrinsic = enum(u32) {
__truncxfdf2,
__truncxfhf2,
__truncxfsf2,
__udivei4,
__udivei5,
__udivti3,
__umodei4,
__umodei5,
__umodti3,
ceilq,
cos,