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From: Mark W. <ma...@kl...> - 2020-11-05 17:51:59
|
Hi valgrind hackers, On Fri, 2020-10-30 at 12:37 +0100, Mark Wielaard wrote: > We are working on supporting the arm64 fmadd/sub instructions for 32bit > floats and 64bit doubles using Iop_MAdd/SubF32/F64. See > > https://bugs.kde.org/show_bug.cgi?id=426014 > > One embarrassing bug we introduced was mixing up the order of Addend > (A) and Product (NxM), causing hilarious results. > > We were wondering in which order other arches (ppc, s390 and mips) were > storing the original arguments for the Iop_MAdd/SubF32/F64. We are > currently storing them as RoundingMode, A, N, M. > > Is that the same as other arches are using those Iops? Is that > documented somewhere we missed? And are there any helpers that we could > have used to get/keep this correct? On irc Julian pointed out that I had overlooked the definition in libvex_ir.h: /* Fused multiply-add/sub */ /* :: IRRoundingMode(I32) x F32 x F32 x F32 -> F32 (computes arg2 * arg3 +/- arg4) */ Iop_MAddF32, Iop_MSubF32, /* Ternary operations, with rounding. */ /* Fused multiply-add/sub, with 112-bit intermediate precision for ppc. Also used to implement fused multiply-add/sub for s390. */ /* :: IRRoundingMode(I32) x F64 x F64 x F64 -> F64 (computes arg2 * arg3 +/- arg4) */ Iop_MAddF64, Iop_MSubF64, That settles it. Sorry for overlooking the obvious place to look. We will change the argument order to follow the above definition. Cheers, Mark |