A patch for this bug has been merged here: https://git.qemu.org/?p=qemu.git;a=commitdiff;h=cbc65a8f22b29680f3 ... can we close this ticket now or is there more to do?
-- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1841491 Title: floating point emulation can fail to set FE_UNDERFLOW Status in QEMU: Confirmed Bug description: Floating point emulation can fail to set FE_UNDERFLOW in some circumstances. This shows up often in glibc's "math" tests. A similar test is attached. This is similar to bug #1841442, but not the same problem, and I don't think the fix will be in the same code. On ppc64le native: -- $ gcc -c -O2 fma.c $ gcc -O2 test-fma.c fma.o -lm -o test-fma $ ./test-fma $(./test-fma) fma(0x1.ffffffffffffcp-1022, 0x1.0000000000001p-1, 0x0.0000000000001p-1022) 0x0 0xa000000 FE_INEXACT FE_UNDERFLOW 0x1p-1022 -- On qemu-system-ppc64: -- $ ./test-fma $(./test-fma) fma(0x1.ffffffffffffcp-1022, 0x1.0000000000001p-1, 0x0.0000000000001p-1022) 0x0 0x2000000 FE_INEXACT 0x1p-1022 -- 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 There are worse symptoms on qemu-x86_64, but this is apparently not surprising per https://bugs.launchpad.net/qemu/+bug/1841442/comments/6. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1841491/+subscriptions
