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cbe: changes to get zig2.c compiling under msvc

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- Add cpuid / getXCR0 functions for the cbe to use instead of asm blocks
- Don't cast between 128 bit types during truncation
- Fixup truncation to use functions for shifts / adds
- Fixup float casts for undefined values
- Add test for 128 bit integer truncation
This commit is contained in:
kcbanner
2022-12-28 02:05:15 -05:00
parent f07d33f54b
commit 676e4f3824
4 changed files with 107 additions and 32 deletions
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14
test/behavior/basic.zig
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@@ -37,6 +37,20 @@ test "truncate to non-power-of-two integers" {
try testTrunc(i32, i5, std.math.maxInt(i32), -1);
}
test "truncate to non-power-of-two integers from 128-bit" {
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
try testTrunc(u128, u1, 0xffffffff_ffffffff_ffffffff_01010101, 0x01);
try testTrunc(u128, u1, 0xffffffff_ffffffff_ffffffff_01010110, 0x00);
try testTrunc(u128, u2, 0xffffffff_ffffffff_ffffffff_01010101, 0x01);
try testTrunc(u128, u2, 0xffffffff_ffffffff_ffffffff_01010102, 0x02);
try testTrunc(i128, i5, -4, -4);
try testTrunc(i128, i5, 4, 4);
try testTrunc(i128, i5, -28, 4);
try testTrunc(i128, i5, 28, -4);
try testTrunc(i128, i5, std.math.maxInt(i128), -1);
}
fn testTrunc(comptime Big: type, comptime Little: type, big: Big, little: Little) !void {
try expect(@truncate(Little, big) == little);
}