search for: clmul

<div> </div><div><div><p>Carry-less multiplication[1] instructions exist (at least optionally) on many architectures: armv8, RISC-V, x86_64, POWER, SPARC, C64x, and possibly more.</p><p>This proposal is to add a <code>llvm.clmul</code> instruction. Or if that is contentious, <code>llvm.experimental.bitmanip.clmul</code> instruction. It takes two integer operands of the same width, and returns an integer with twice the width of the operands. (Is there a good reason to make these the same width, as all the...

...t 12:18 PM Shawn Landden via llvm-dev > <llvm-dev at lists.llvm.org> wrote: >>  Carry-less multiplication[1] instructions exist (at least optionally) on many architectures: armv8, RISC-V, x86_64, POWER, SPARC, C64x, and possibly more. >> >>  This proposal is to add a llvm.clmul instruction. Or if that is contentious, llvm.experimental.bitmanip.clmul instruction. It takes two integer operands of the same width, and returns an integer with twice the width of the operands. (Is there a good reason to make these the same width, as all the other operations do even when it doesn...

...Jul 5, 2020, at 5:18 AM, Shawn Landden via llvm-dev <llvm-dev at lists.llvm.org> wrote: > > Carry-less multiplication[1] instructions exist (at least optionally) on many architectures: armv8, RISC-V, x86_64, POWER, SPARC, C64x, and possibly more. > > This proposal is to add a llvm.clmul instruction. Or if that is contentious, llvm.experimental.bitmanip.clmul instruction. It takes two integer operands of the same width, and returns an integer with twice the width of the operands. (Is there a good reason to make these the same width, as all the other operations do even when it doesn...

...via llvm-dev > <llvm-dev at lists.llvm.org> wrote: >> >> >> >> Carry-less multiplication[1] instructions exist (at least optionally) on many architectures: armv8, RISC-V, x86_64, POWER, SPARC, C64x, and possibly more. >> >> This proposal is to add a llvm.clmul instruction. Or if that is contentious, llvm.experimental.bitmanip.clmul instruction. It takes two integer operands of the same width, and returns an integer with twice the width of the operands. (Is there a good reason to make these the same width, as all the other operations do even when it doesn...