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compiler-rt: Add __divmodsi4, __aeabi_idivmod

master
LemonBoy 2019-04-29 09:01:57 +02:00
parent 738562e990
commit 4e241263ff
1 changed files with 39 additions and 1 deletions
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40
std/special/compiler_rt.zig
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@ -106,6 +106,7 @@ comptime {
@export("__udivsi3", __udivsi3, linkage);
@export("__udivdi3", __udivdi3, linkage);
@export("__umoddi3", __umoddi3, linkage);
@export("__divmodsi4", __divmodsi4, linkage);
@export("__udivmodsi4", __udivmodsi4, linkage);
@export("__negsf2", @import("compiler_rt/negXf2.zig").__negsf2, linkage);
@ -113,10 +114,11 @@ comptime {
if (is_arm_arch and !is_arm_64) {
@export("__aeabi_uldivmod", __aeabi_uldivmod, linkage);
@export("__aeabi_uidivmod", __aeabi_uidivmod, linkage);
@export("__aeabi_idiv", __divsi3, linkage);
@export("__aeabi_idivmod", __divmodsi4, linkage);
@export("__aeabi_uidiv", __udivsi3, linkage);
@export("__aeabi_uidivmod", __aeabi_uidivmod, linkage);
@export("__aeabi_memcpy", __aeabi_memcpy, linkage);
@export("__aeabi_memcpy4", __aeabi_memcpy, linkage);
@ -561,6 +563,14 @@ nakedcc fn ___chkstk_ms() align(4) void {
);
}
extern fn __divmodsi4(a: i32, b: i32, rem: *i32) i32 {
@setRuntimeSafety(is_test);
const d = __divsi3(a, b);
rem.* = a -% (d * b);
return d;
}
extern fn __udivmodsi4(a: u32, b: u32, rem: *u32) u32 {
@setRuntimeSafety(is_test);
@ -1335,3 +1345,31 @@ fn test_one_divsi3(a: i32, b: i32, expected_q: i32) void {
const q: i32 = __divsi3(a, b);
testing.expect(q == expected_q);
}
test "test_divmodsi4" {
const cases = [][4]i32{
[]i32{ 0, 1, 0, 0},
[]i32{ 0, -1, 0, 0},
[]i32{ 2, 1, 2, 0},
[]i32{ 2, -1, -2, 0},
[]i32{-2, 1, -2, 0},
[]i32{-2, -1, 2, 0},
[]i32{ 7, 5, 1, 2},
[]i32{-7, 5, -1, -2},
[]i32{19, 5, 3, 4},
[]i32{19, -5, -3, 4},
[]i32{@bitCast(i32, u32(0x80000000)), 8, @bitCast(i32, u32(0xf0000000)), 0},
[]i32{@bitCast(i32, u32(0x80000007)), 8, @bitCast(i32, u32(0xf0000001)), -1},
};
for (cases) |case| {
test_one_divmodsi4(case[0], case[1], case[2], case[3]);
}
}
fn test_one_divmodsi4(a: i32, b: i32, expected_q: i32, expected_r: i32) void {
var r: i32 = undefined;
const q: i32 = __divmodsi4(a, b, &r);
testing.expect(q == expected_q and r == expected_r);
}