add launchpad bug reports without comments

1 files changed, 35 insertions, 0 deletions

diff --git a/results/scraper/launchpad-without-comments/1841491 b/results/scraper/launchpad-without-comments/1841491
new file mode 100644
index 00000000..2b27e129
--- /dev/null
+++ b/results/scraper/launchpad-without-comments/1841491
@@ -0,0 +1,35 @@
+floating point emulation can fail to set FE_UNDERFLOW
+
+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.
\ No newline at end of file