Remove unnecessary logic
LemonBoy
parent
44e3796285
commit
109e5f8a5a
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@ -177,10 +177,6 @@ comptime {
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@export(@import("compiler_rt/arm.zig").__aeabi_memclr, .{ .name = "__aeabi_memclr4", .linkage = linkage });
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@export(@import("compiler_rt/arm.zig").__aeabi_memclr, .{ .name = "__aeabi_memclr8", .linkage = linkage });
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@export(@import("compiler_rt/arm.zig").__aeabi_memcmp, .{ .name = "__aeabi_memcmp", .linkage = linkage });
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@export(@import("compiler_rt/arm.zig").__aeabi_memcmp, .{ .name = "__aeabi_memcmp4", .linkage = linkage });
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@export(@import("compiler_rt/arm.zig").__aeabi_memcmp, .{ .name = "__aeabi_memcmp8", .linkage = linkage });
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@export(@import("compiler_rt/extendXfYf2.zig").__aeabi_f2d, .{ .name = "__aeabi_f2d", .linkage = linkage });
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@export(@import("compiler_rt/floatsiXf.zig").__aeabi_i2d, .{ .name = "__aeabi_i2d", .linkage = linkage });
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@export(@import("compiler_rt/floatdidf.zig").__aeabi_l2d, .{ .name = "__aeabi_l2d", .linkage = linkage });
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@ -2,204 +2,36 @@
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const builtin = @import("builtin");
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const is_test = builtin.is_test;
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const use_thumb_1 = usesThumb1(builtin.arch);
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const __divmodsi4 = @import("int.zig").__divmodsi4;
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const __udivmodsi4 = @import("int.zig").__udivmodsi4;
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const __divmoddi4 = @import("int.zig").__divmoddi4;
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const __udivmoddi4 = @import("int.zig").__udivmoddi4;
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fn usesThumb1(arch: builtin.Arch) bool {
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return switch (arch) {
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.arm => |sub_arch| switch (sub_arch) {
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.v6m => true,
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else => false,
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},
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.armeb => |sub_arch| switch (sub_arch) {
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.v6m => true,
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else => false,
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},
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.thumb => |sub_arch| switch (sub_arch) {
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.v5,
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.v5te,
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.v4t,
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.v6,
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.v6m,
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.v6k,
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=> true,
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else => false,
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},
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.thumbeb => |sub_arch| switch (sub_arch) {
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.v5,
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.v5te,
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.v4t,
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.v6,
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.v6m,
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.v6k,
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=> true,
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else => false,
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},
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else => false,
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};
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}
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extern fn memset(dest: ?[*]u8, c: u8, n: usize) ?[*]u8;
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extern fn memcpy(noalias dest: ?[*]u8, noalias src: ?[*]const u8, n: usize) ?[*]u8;
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extern fn memmove(dest: ?[*]u8, src: ?[*]const u8, n: usize) ?[*]u8;
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test "usesThumb1" {
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testing.expect(usesThumb1(builtin.Arch{ .arm = .v6m }));
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testing.expect(!usesThumb1(builtin.Arch{ .arm = .v5 }));
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//etc.
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testing.expect(usesThumb1(builtin.Arch{ .armeb = .v6m }));
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testing.expect(!usesThumb1(builtin.Arch{ .armeb = .v5 }));
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//etc.
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testing.expect(usesThumb1(builtin.Arch{ .thumb = .v5 }));
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testing.expect(usesThumb1(builtin.Arch{ .thumb = .v5te }));
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testing.expect(usesThumb1(builtin.Arch{ .thumb = .v4t }));
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testing.expect(usesThumb1(builtin.Arch{ .thumb = .v6 }));
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testing.expect(usesThumb1(builtin.Arch{ .thumb = .v6k }));
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testing.expect(usesThumb1(builtin.Arch{ .thumb = .v6m }));
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testing.expect(!usesThumb1(builtin.Arch{ .thumb = .v6t2 }));
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//etc.
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testing.expect(usesThumb1(builtin.Arch{ .thumbeb = .v5 }));
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testing.expect(usesThumb1(builtin.Arch{ .thumbeb = .v5te }));
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testing.expect(usesThumb1(builtin.Arch{ .thumbeb = .v4t }));
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testing.expect(usesThumb1(builtin.Arch{ .thumbeb = .v6 }));
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testing.expect(usesThumb1(builtin.Arch{ .thumbeb = .v6k }));
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testing.expect(usesThumb1(builtin.Arch{ .thumbeb = .v6m }));
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testing.expect(!usesThumb1(builtin.Arch{ .thumbeb = .v6t2 }));
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//etc.
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testing.expect(!usesThumb1(builtin.Arch{ .aarch64 = .v8 }));
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testing.expect(!usesThumb1(builtin.Arch{ .aarch64_be = .v8 }));
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testing.expect(!usesThumb1(builtin.Arch.x86_64));
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testing.expect(!usesThumb1(builtin.Arch.riscv32));
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//etc.
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}
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const use_thumb_1_pre_armv6 = usesThumb1PreArmv6(builtin.arch);
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fn usesThumb1PreArmv6(arch: builtin.Arch) bool {
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return switch (arch) {
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.thumb => |sub_arch| switch (sub_arch) {
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.v5, .v5te, .v4t => true,
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else => false,
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},
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.thumbeb => |sub_arch| switch (sub_arch) {
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.v5, .v5te, .v4t => true,
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else => false,
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},
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else => false,
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};
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}
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pub fn __aeabi_memcpy() callconv(.Naked) noreturn {
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pub fn __aeabi_memcpy(dest: [*]u8, src: [*]u8, n: usize) callconv(.AAPCS) void {
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@setRuntimeSafety(false);
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if (use_thumb_1) {
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asm volatile (
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\\ push {r7, lr}
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\\ bl memcpy
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\\ pop {r7, pc}
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);
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} else {
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asm volatile (
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\\ b memcpy
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);
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}
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unreachable;
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_ = memcpy(dest, src, n);
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}
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pub fn __aeabi_memmove() callconv(.Naked) noreturn {
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pub fn __aeabi_memmove(dest: [*]u8, src: [*]u8, n: usize) callconv(.AAPCS) void {
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@setRuntimeSafety(false);
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if (use_thumb_1) {
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asm volatile (
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\\ push {r7, lr}
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\\ bl memmove
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\\ pop {r7, pc}
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);
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} else {
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asm volatile (
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\\ b memmove
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);
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}
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unreachable;
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_ = memmove(dest, src, n);
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}
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pub fn __aeabi_memset() callconv(.Naked) noreturn {
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pub fn __aeabi_memset(dest: [*]u8, n: usize, c: u8) callconv(.AAPCS) void {
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@setRuntimeSafety(false);
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if (use_thumb_1_pre_armv6) {
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asm volatile (
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\\ eors r1, r2
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\\ eors r2, r1
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\\ eors r1, r2
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\\ push {r7, lr}
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\\ b memset
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\\ pop {r7, pc}
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);
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} else if (use_thumb_1) {
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asm volatile (
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\\ mov r3, r1
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\\ mov r1, r2
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\\ mov r2, r3
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\\ push {r7, lr}
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\\ b memset
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\\ pop {r7, pc}
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);
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} else {
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asm volatile (
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\\ mov r3, r1
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\\ mov r1, r2
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\\ mov r2, r3
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\\ b memset
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);
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}
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unreachable;
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// This is dentical to the standard `memset` definition but with the last
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// two arguments swapped
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_ = memset(dest, c, n);
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}
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pub fn __aeabi_memclr() callconv(.Naked) noreturn {
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pub fn __aeabi_memclr(dest: [*]u8, n: usize) callconv(.AAPCS) void {
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@setRuntimeSafety(false);
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if (use_thumb_1_pre_armv6) {
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asm volatile (
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\\ adds r2, r1, #0
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\\ movs r1, #0
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\\ push {r7, lr}
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\\ bl memset
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\\ pop {r7, pc}
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);
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} else if (use_thumb_1) {
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asm volatile (
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\\ mov r2, r1
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\\ movs r1, #0
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\\ push {r7, lr}
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\\ bl memset
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\\ pop {r7, pc}
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);
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} else {
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asm volatile (
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\\ mov r2, r1
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\\ movs r1, #0
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\\ b memset
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);
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_ = memset(dest, 0, n);
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}
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unreachable;
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}
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pub fn __aeabi_memcmp() callconv(.Naked) noreturn {
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@setRuntimeSafety(false);
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if (use_thumb_1) {
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asm volatile (
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\\ push {r7, lr}
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\\ bl memcmp
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\\ pop {r7, pc}
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);
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} else {
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asm volatile (
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\\ b memcmp
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);
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}
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unreachable;
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}
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pub fn __aeabi_unwind_cpp_pr0() callconv(.C) void {
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unreachable;
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}
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