Fixed by 16ce2fffa660 ("target/ppc: Fix do_float_check_status vs
inexact")
** Changed in: qemu
Status: Confirmed => Fix Released
--
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https://bugs.launchpad.net/bugs/1841442
Title:
floating point emulation can fail to set FE_INEXACT
Status in QEMU:
Fix Released
Bug description:
Floating point emulation can fail to set FE_INEXACT in some
circumstances. This shows up quite often in glibc's "math" tests. A
similar test is attached.
On ppc64le native:
--
$ gcc nextafter.c -o nextafter -lm
$ ./nextafter $(./nextafter)
0x0000000000000001 0.000000
0x0
0xa000000
FE_INEXACT FE_UNDERFLOW
0x0000000000000000 0.000000
--
On x86_64:
--
$ gcc nextafter.c -o nextafter -lm
$ ./nextafter $(./nextafter)
0x0000000000000001 0.000000
0x0
0x30
FE_INEXACT FE_UNDERFLOW
0x0000000000000000 0.000000
--
Using qemu-system-ppc64
--
$ ./nextafter $(./nextafter)
0x0000000000000001 0.000000
0x0
0x8000000
FE_UNDERFLOW
0x0000000000000000 0.000000
--
Using qemu-x86_64:
--
$ ./nextafter $(./nextafter)
0x0000000000000001 0.000000
0x0
0x0
0x0000000000000000 0.000000
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QEMU versions vary, but not too much, and are pretty close to git HEAD:
- 586f3dced9 (HEAD -> master, origin/master, origin/HEAD) Merge
remote-tracking branch 'remotes/cohuck/tags/s390x-20190822' into staging
- 864ab31 Update version for v4.1.0-rc4 release
Since the issue happens nearly identically on different targets, I
suspect the issue lies somewhere in fpu/softfloat.c.
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