1 files changed, 27 insertions, 0 deletions

diff --git a/gitlab/issues/target_sparc/host_missing/accel_missing/1901.toml b/gitlab/issues/target_sparc/host_missing/accel_missing/1901.toml
new file mode 100644
index 00000000..198b1b3f
--- /dev/null
+++ b/gitlab/issues/target_sparc/host_missing/accel_missing/1901.toml
@@ -0,0 +1,27 @@
+id = 1901
+title = "qemu-sparc64 / sparc32plus apparent wrong results from VIS fmul8x16 instruction"
+state = "closed"
+created_at = "2023-09-22T19:14:54.496Z"
+closed_at = "2024-05-06T22:29:26.400Z"
+labels = ["target: sparc"]
+url = "https://gitlab.com/qemu-project/qemu/-/issues/1901"
+host-os = "Gentoo GNU/Linux"
+host-arch = "ppc64le"
+qemu-version = "qemu-sparc64 version 8.1.50 (v8.1.0-951-gb55e4b9c05); also observed in 8.0.4 release"
+guest-os = "N/A"
+guest-arch = "SPARC (v9 w/ VIS)"
+description = """Experimenting with SPARC emulation, I noticed that the results of the UltraSparc fmul8x16 instruction don't appear to match the behaviour of real silicon (aka it doesn't appear to work at all -- in the test program, the result seems to be always 0).  Other VIS instructions I tried seem to be OK (I have not tried all of them).
+
+The same problem is observed both in 64-bit (qemu-sparc64) and 32-bit (qemu-sparc32plus) applications."""
+reproduce = """1. Compile the attached test program (which exhaustively tests all possible combinations of 16-bit and 8-bit inputs) with gcc:
+   ```
+   sparc64-unknown-linux-gnu-gcc -static -Os -mcpu=ultrasparc -mvis -o test_fmul8x16 test_fmul8x16.c
+   ```
+2. Run it in qemu-sparc64:
+   ```
+   qemu-sparc64 -cpu 'TI UltraSparc II' ./test_fmul8x16
+   ```
+3. Observe almost all tests fail.
+
+   Running the exact same compiled binary on a real UltraSparc II CPU gives all pass results."""
+additional = """[test_fmul8x16.c](/uploads/2bf68e53652fba2ed69ac3ebb3f4b5e9/test_fmul8x16.c)"""