This patch series implements support in QEMU for some (user-mode) instructions which are present on some recent processors (eg Cortex-A15).
The new instructions are UDIV/SDIV (previously only available as a Thumb encoding for R and M-class cores, now an optional extension to ARMv7A), and the fused-multiply-accumulate instructions VFMA, VFMS, VFNMA, VFNMS. We don't (yet) support a specific processor for system mode with these extensions, so they are enabled only for ARM_CPUID_ANY. The most interesting part of this is the fused multiply-accumulate support which I have added to softfloat. Although this is only used by ARM at the moment I've put in some flags which should be sufficient for the variants provided by other architectures. (Specifically, x86, Itanium and SPARC64 VI all need the "negate product" flag since they have "-(a*b)+c" instructions. PPC needs the "negate result" and "negate addend" flags.) Changes v1 -> v2: * incorporated RTH's suggestions in the main "implement fused multiply-add" patch (except the one about #ifdef placement, which I disagree with) * added a patch renaming ARM_FEATURE_DIV to ARM_FEATURE_THUMB_DIV; this splits "core implements Thumb encodings of UDIV,SDIV" from "core implements ARM encodings of UDIV,SDIV"; we don't have any cores at the moment where this would make a difference, but they are architecturally distinct and the split will avoid having to rejig things for R4 support (R4 has only the Thumb encodings) * rebased (and dropped the 'reinstate target-specific NaN handling' patch as it has been committed) Peter Maydell (5): target-arm: v6 media multiply space: UNDEF on unassigned encodings target-arm: Rename ARM_FEATURE_DIV to _THUMB_DIV target-arm: Add ARM UDIV/SDIV support softfloat: Implement fused multiply-add target-arm: Implement VFPv4 fused multiply-accumulate insns fpu/softfloat-specialize.h | 178 ++++++++++++++++++ fpu/softfloat.c | 427 ++++++++++++++++++++++++++++++++++++++++++++ fpu/softfloat.h | 14 ++ target-arm/cpu.h | 4 +- target-arm/helper.c | 21 ++- target-arm/helper.h | 3 + target-arm/translate.c | 118 ++++++++++++- 7 files changed, 757 insertions(+), 8 deletions(-)
