sema: fix result ptr coercion array -> vector

Previously this worked for array to vector where the element type
matched exactly (e.g `[4]u8` to `@Vector(4, u8)`) since that is
performed with a simple `.bitcast` operation, but now it also works for
types where the array is coercible to the vector type (e.g `[4]u8` to
`@Vector(4, u16)`).

1 files changed, 19 insertions, 0 deletions

diff --git a/test/behavior/vector.zig b/test/behavior/vector.zig
index 2c7be227c4..b1c0e310fe 100644
--- a/test/behavior/vector.zig
+++ b/test/behavior/vector.zig
@@ -175,6 +175,25 @@ test "array to vector" {
     comptime try S.doTheTest();
 }
 
+test "array to vector with element type coercion" {
+    if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
+
+    const S = struct {
+        fn doTheTest() !void {
+            var foo: f16 = 3.14;
+            var arr32 = [4]f32{ foo, 1.5, 0.0, 0.0 };
+            var vec: @Vector(4, f32) = [4]f16{ foo, 1.5, 0.0, 0.0 };
+            try std.testing.expect(std.mem.eql(f32, &@as([4]f32, vec), &arr32));
+        }
+    };
+    try S.doTheTest();
+    comptime try S.doTheTest();
+}
+
 test "peer type resolution with coercible element types" {
     if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO