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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.
25 lines
850 B
Zig
25 lines
850 B
Zig
const compiler_rt = @import("../compiler_rt.zig");
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const symbol = compiler_rt.symbol;
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const testing = @import("std").testing;
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comptime {
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symbol(&__subvsi3, "__subvsi3");
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}
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pub fn __subvsi3(a: i32, b: i32) callconv(.c) i32 {
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const sum = a -% b;
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// Overflow occurred iff the operands have opposite signs, and the sign of the
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// sum is the opposite of the lhs sign.
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if (((a ^ b) & (sum ^ a)) < 0) @panic("compiler-rt: integer overflow");
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return sum;
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}
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test "subvsi3" {
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// min i32 = -2147483648
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// max i32 = 2147483647
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// TODO write panic handler for testing panics
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// try test__subvsi3(-2147483648, -1, -1); // panic
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// try test__subvsi3(2147483647, 1, 1); // panic
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try testing.expectEqual(-2147483648, __subvsi3(-2147483647, 1));
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try testing.expectEqual(2147483647, __subvsi3(2147483646, -1));
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}
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