mulvsi3.zig (902B) - Raw
1 const mulv = @import("mulo.zig"); 2 const common = @import("./common.zig"); 3 const testing = @import("std").testing; 4 5 pub const panic = common.panic; 6 7 comptime { 8 @export(&__mulvsi3, .{ .name = "__mulvsi3", .linkage = common.linkage, .visibility = common.visibility }); 9 } 10 11 pub fn __mulvsi3(a: i32, b: i32) callconv(.c) i32 { 12 var overflow: c_int = 0; 13 const sum = mulv.__mulosi4(a, b, &overflow); 14 if (overflow != 0) @panic("compiler-rt: integer overflow"); 15 return sum; 16 } 17 18 test "mulvsi3" { 19 // min i32 = -2147483648 20 // max i32 = 2147483647 21 // TODO write panic handler for testing panics 22 // try test__mulvsi3(-2147483648, -1, -1); // panic 23 // try test__mulvsi3(2147483647, 1, 1); // panic 24 try testing.expectEqual(-2147483648, __mulvsi3(-1073741824, 2)); 25 try testing.expectEqual(2147483646, __mulvsi3(1073741823, 2)); // one too less for corner case 2147483647 26 }