Add compiler-rt stub for SPARC CPUs

lib/std/special/compiler_rt.zig

@@ -277,6 +277,25 @@ comptime {
         @export(@import("compiler_rt/aullrem.zig")._aullrem, .{ .name = "\x01__aullrem", .linkage = strong_linkage });
     }
 
+    if (builtin.arch.isSPARC()) {
+        // SPARC systems use a different naming scheme
+        @export(@import("compiler_rt/sparc.zig")._Qp_add, .{ .name = "_Qp_add", .linkage = linkage });
+        @export(@import("compiler_rt/sparc.zig")._Qp_div, .{ .name = "_Qp_div", .linkage = linkage });
+        @export(@import("compiler_rt/sparc.zig")._Qp_mul, .{ .name = "_Qp_mul", .linkage = linkage });
+        @export(@import("compiler_rt/sparc.zig")._Qp_sub, .{ .name = "_Qp_sub", .linkage = linkage });
+
+        @export(@import("compiler_rt/sparc.zig")._Qp_cmp, .{ .name = "_Qp_cmp", .linkage = linkage });
+        @export(@import("compiler_rt/sparc.zig")._Qp_feq, .{ .name = "_Qp_feq", .linkage = linkage });
+        @export(@import("compiler_rt/sparc.zig")._Qp_fne, .{ .name = "_Qp_fne", .linkage = linkage });
+        @export(@import("compiler_rt/sparc.zig")._Qp_flt, .{ .name = "_Qp_flt", .linkage = linkage });
+        @export(@import("compiler_rt/sparc.zig")._Qp_fle, .{ .name = "_Qp_fle", .linkage = linkage });
+        @export(@import("compiler_rt/sparc.zig")._Qp_fgt, .{ .name = "_Qp_fgt", .linkage = linkage });
+        @export(@import("compiler_rt/sparc.zig")._Qp_fge, .{ .name = "_Qp_fge", .linkage = linkage });
+
+        @export(@import("compiler_rt/sparc.zig")._Qp_dtoq, .{ .name = "_Qp_dtoq", .linkage = linkage });
+        @export(@import("compiler_rt/sparc.zig")._Qp_qtod, .{ .name = "_Qp_qtod", .linkage = linkage });
+    }
+
     if (builtin.os.tag == .windows) {
         // Default stack-probe functions emitted by LLVM
         if (is_mingw) {

lib/std/special/compiler_rt/sparc.zig

@@ -0,0 +1,80 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
+//
+// SPARC uses a different naming scheme for its support routines so we map it here to the x86 name.
+
+const std = @import("std");
+const builtin = @import("builtin");
+
+// The SPARC Architecture Manual, Version 9:
+// A.13 Floating-Point Compare
+const FCMP = extern enum(i32) {
+    Equal = 0,
+    Less = 1,
+    Greater = 2,
+    Unordered = 3,
+};
+
+// Basic arithmetic
+
+pub fn _Qp_add(c: *f128, a: *f128, b: *f128) callconv(.C) void {
+    c.* = @import("addXf3.zig").__addtf3(a.*, b.*);
+}
+
+pub fn _Qp_div(c: *f128, a: *f128, b: *f128) callconv(.C) void {
+    c.* = @import("divtf3.zig").__divtf3(a.*, b.*);
+}
+
+pub fn _Qp_mul(c: *f128, a: *f128, b: *f128) callconv(.C) void {
+    c.* = @import("mulXf3.zig").__multf3(a.*, b.*);
+}
+
+pub fn _Qp_sub(c: *f128, a: *f128, b: *f128) callconv(.C) void {
+    c.* = @import("addXf3.zig").__subtf3(a.*, b.*);
+}
+
+// Comparison
+
+pub fn _Qp_cmp(a: f128, b: f128) callconv(.C) i32 {
+    return @enumToInt(@import("compareXf2.zig").cmp(f128, FCMP, a, b));
+}
+
+pub fn _Qp_feq(a: *f128, b: *f128) callconv(.C) bool {
+    return _Qp_cmp(a.*, b.*) == @enumToInt(FCMP.Equal);
+}
+
+pub fn _Qp_fne(a: *f128, b: *f128) callconv(.C) bool {
+    return _Qp_cmp(a.*, b.*) != @enumToInt(FCMP.Equal);
+}
+
+pub fn _Qp_flt(a: *f128, b: *f128) callconv(.C) bool {
+    return _Qp_cmp(a.*, b.*) == @enumToInt(FCMP.Less);
+}
+
+pub fn _Qp_fle(a: *f128, b: *f128) callconv(.C) bool {
+    const cmp = _Qp_cmp(a.*, b.*);
+    return cmp == @enumToInt(FCMP.Less) or cmp == @enumToInt(FCMP.Equal);
+}
+
+pub fn _Qp_fgt(a: *f128, b: *f128) callconv(.C) bool {
+    return _Qp_cmp(a.*, b.*) == @enumToInt(FCMP.Greater);
+}
+
+pub fn _Qp_fge(a: *f128, b: *f128) callconv(.C) bool {
+    const cmp = _Qp_cmp(a.*, b.*);
+    return cmp == @enumToInt(FCMP.Greater) or cmp == @enumToInt(FCMP.Equal);
+}
+
+
+// Casting
+
+pub fn _Qp_dtoq(c: *f128, a: f64) callconv(.C) void {
+    c.* = @import("extendXfYf2.zig").__extenddftf2(a);
+}
+
+pub fn _Qp_qtod(a: *f128) callconv(.C) f64 {
+    return @import("truncXfYf2.zig").__trunctfdf2(a.*);
+}