[llvm-commits] [llvm] r61424 - in /llvm/trunk/lib/Target/X86: X86Instr64bit.td X86InstrInfo.td

[Eli Friedman]

On Wed, Dec 24, 2008 at 5:27 PM, Chris Lattner <sabre at nondot.org> wrote:
> Author: lattner
> Date: Wed Dec 24 19:27:10 2008
> New Revision: 61424
>
> URL: http://llvm.org/viewvc/llvm-project?rev=61424&view=rev
> Log:
> BT memory operands load from their address operand.

Do we really want to map this to the same intrinsic as the register
form?  "mov (%esp), %eax; bt %ebx, %eax;" has different semantics from
"bt %ebx, (%esp), ", and the latter form is significantly slower.

-Eli