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-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)"""