cbe: changes to get zig2.c compiling under msvc

- 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

1 files changed, 14 insertions, 0 deletions

diff --git a/test/behavior/basic.zig b/test/behavior/basic.zig
index 6fcef06fc1..e704e190f3 100644
--- a/test/behavior/basic.zig
+++ b/test/behavior/basic.zig
@@ -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);
 }