• Clemens Backes's avatar
    Revert "[wasm-simd][liftoff] Add S128 case for stack movements" · f3a5c36a
    Clemens Backes authored
    This reverts commit 5cfe053e.
    
    Reason for revert: "liftoff-simd-params" also fails on no-sse :/
    
    Original change's description:
    > [wasm-simd][liftoff] Add S128 case for stack movements
    > 
    > The two cases we are fixing here are Construct and
    > LoadCallerFrameSlot, which are closely related.
    > 
    > Construct is called during PrepareCall, where we build up
    > LiftoffStackSlots when we need to move an arg from caller's stack frame
    > into callee's stack frame. LoadCallerFrameSlot is the parallel to
    > this, called in ProcessParameter during decoding of the callee's
    > function body.
    > 
    > In most cases, Construct needs a new case to handle kWasmS128, and calls
    > the relevant assembler to push a s128 onto the stack.
    > 
    > ARM64 requires 16-byte alignment of sp, so we need to Claim the right
    > number of kXRegSize slots first, which requires
    > us traversing the list of slots to figure out how many s128 values there
    > are. This is a straightforward way to fix this, if efficiency is a
    > problem, we can change LiftOffStackSlots::Add to sum up the slot sizes.
    > 
    > On IA32, pushing s128 values will require 4 calls to push. Instead, we
    > use a sub and two movdqu, which will generate less code in most cases.
    > 
    > On x64, there is no 128-bit push, so we call push twice.
    > 
    > Bug: v8:9909
    > Change-Id: I3af35b8462ea9c3b9b2d90800c37d11b5e95be59
    > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2015945
    > Commit-Queue: Zhi An Ng <zhin@chromium.org>
    > Reviewed-by: Clemens Backes <clemensb@chromium.org>
    > Cr-Commit-Position: refs/heads/master@{#65956}
    
    TBR=clemensb@chromium.org,zhin@chromium.org,joey.gouly@arm.com
    
    Change-Id: Ib3c5a088e2d85baf1d8b143272844fb5ebb33c57
    No-Presubmit: true
    No-Tree-Checks: true
    No-Try: true
    Bug: v8:9909
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2017724Reviewed-by: 's avatarClemens Backes <clemensb@chromium.org>
    Commit-Queue: Clemens Backes <clemensb@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#65960}
    f3a5c36a
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