[LLVMbugs] [Bug 15546] New: Possible unsafe maths bug in NEON VMUL.f32

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Tue Mar 19 11:08:21 PDT 2013


            Bug ID: 15546
           Summary: Possible unsafe maths bug in NEON VMUL.f32
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: ARM
          Assignee: unassignedbugs at nondot.org
          Reporter: renato.golin at linaro.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

As described in bug #15545, NEON's SPFP VMUL is not IEEE 754 compliant and that
is failing a test (TSVC).

But NEON VMUL.f32 is faster than VFP's version, so in A8, A5 and Swift, it's
enabled by default.

Question is: do we really want this enabled by default when safe-math is on?

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