diff options
Diffstat (limited to 'gitlab/issues/target_sparc/host_missing/accel_TCG/2802.toml')
| -rw-r--r-- | gitlab/issues/target_sparc/host_missing/accel_TCG/2802.toml | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/gitlab/issues/target_sparc/host_missing/accel_TCG/2802.toml b/gitlab/issues/target_sparc/host_missing/accel_TCG/2802.toml new file mode 100644 index 00000000..bb6b2ef8 --- /dev/null +++ b/gitlab/issues/target_sparc/host_missing/accel_TCG/2802.toml @@ -0,0 +1,34 @@ +id = 2802 +title = "Sparc: fdtox/fqtox instructions incorrectly select destination register" +state = "closed" +created_at = "2025-02-03T13:33:15.753Z" +closed_at = "2025-02-19T02:48:16.475Z" +labels = ["TestCase", "accel: TCG", "target: sparc", "workflow::Patch available"] +url = "https://gitlab.com/qemu-project/qemu/-/issues/2802" +host-os = "Debian 12 container running on Arch Linux" +host-arch = "x86_64" +qemu-version = "9.2.0" +guest-os = "n/a" +guest-arch = "Sparc64" +description = """This bug report is mostly for informational purposes as I will be posting a fix for the bug. + +The `fdtox` and `fqtox` instructions incorrectly select the destination register when the destination register is higher than `f31`.""" +reproduce = """1. Install Sparc cross compiler `gcc-12-sparc64-linux-gnu`(in Debian) +2. Compile the test program using `sparc64-linux-gnu-gcc-12 -m64 -o test_program -static test_program.c` +3. Run the test program using `qemu-sparc64-static ./test_program` +4. Expected output is 60. Prints 0 instead.""" +additional = """Test program to test the issue: + +```c +#include <stdio.h> + +int main(int argc, char** argv) { + long long truncated = 0; + __asm__("fdtox %0,%%f32\\n\\t" :: "f"(60.0)); + __asm__("fmovd %%f32,%0\\n\\t" : "=f"(truncated)); + printf("%lld\\n", truncated); + return 0; +} +``` + +The issue is caused by the commit 0bba7572d4. Where certain changes were made in the way destination registers are selected(moving the DFPREG/QFPREG to decodetree).""" |