diff options
Diffstat (limited to 'results/classifier/accel-gemma3:12b/tcg/1821444')
| -rw-r--r-- | results/classifier/accel-gemma3:12b/tcg/1821444 | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/results/classifier/accel-gemma3:12b/tcg/1821444 b/results/classifier/accel-gemma3:12b/tcg/1821444 new file mode 100644 index 000000000..67509821c --- /dev/null +++ b/results/classifier/accel-gemma3:12b/tcg/1821444 @@ -0,0 +1,30 @@ + +qemu-ppc (user) incorrectly translates float32 arithmetics + +I'm using qemu-3.1.0 (Gentoo). + +When I was running regression test suite via qemu-ppc for GHC I noticed a few uint32_t<->float32 failures I did not expect to encounter. + +Here is an example + +$ cat a.c +#include <stdio.h> +#include <stdint.h> + +int main() { + volatile uint32_t i = 1; + printf("0x1 = %e\n", *(volatile float*)&i); +} + +$ powerpc-unknown-linux-gnu-gcc -O2 a.c -Wall -o a -fno-strict-aliasing -fno-stack-protector -static && ./a +0x1 = 2.802597e-45 + +$ scp a timberdoodle.ppc64.dev.gentoo.org:~/ +a 100% 826KB 102.0KB/s 00:08 + +$ ssh timberdoodle.ppc64.dev.gentoo.org ./a +0x1 = 1.401298e-45 +$ qemu-ppc ./a +0x1 = 2.802597e-45 + +Looks like off-by-one bit somewhere. I'm not sure if it's FPU instruction or some internals of printf() that are emulated incorrectly. \ No newline at end of file |