Bug 70501
| Summary: | incorrect emulation of VFP multiply accumulate instructions | ||
|---|---|---|---|
| Product: | Platform Specific/Hardware | Reporter: | Jay Foad (jay.foad) |
| Component: | ARM | Assignee: | linux-arm-kernel (linux-arm-kernel) |
| Status: | NEW --- | ||
| Severity: | normal | CC: | alan |
| Priority: | P1 | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Kernel Version: | 3.6.11+ #538 PREEMPT | Subsystem: | |
| Regression: | No | Bisected commit-id: | |
| Attachments: |
test case
proposed fix fixed test case |
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Created attachment 125911 [details]
proposed fix
Created attachment 125921 [details]
fixed test case
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Created attachment 125901 [details] test case With the attached test case I get: $ gcc -o mac mac.c && ./mac 4.99997e-41 4.99994e-321 It should print (approximately) 1e-40 and 1e-320, so these results are too small by a factor of two. I'm doing this on a Raspberry Pi with an old-ish kernel, but I believe the bug is still present in later kernel versions.