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Auto merge of rust-lang#116307 - RalfJung:miri, r=RalfJung
Miri subtree update r? `@ghost`
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| use rustc_middle::mir; | ||
| use rustc_span::Symbol; | ||
| use rustc_target::abi::Align; | ||
| use rustc_target::spec::abi::Abi; | ||
|
|
||
| use super::horizontal_bin_op; | ||
| use crate::*; | ||
| use shims::foreign_items::EmulateByNameResult; | ||
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| impl<'mir, 'tcx: 'mir> EvalContextExt<'mir, 'tcx> for crate::MiriInterpCx<'mir, 'tcx> {} | ||
| pub(super) trait EvalContextExt<'mir, 'tcx: 'mir>: | ||
| crate::MiriInterpCxExt<'mir, 'tcx> | ||
| { | ||
| fn emulate_x86_sse3_intrinsic( | ||
| &mut self, | ||
| link_name: Symbol, | ||
| abi: Abi, | ||
| args: &[OpTy<'tcx, Provenance>], | ||
| dest: &PlaceTy<'tcx, Provenance>, | ||
| ) -> InterpResult<'tcx, EmulateByNameResult<'mir, 'tcx>> { | ||
| let this = self.eval_context_mut(); | ||
| // Prefix should have already been checked. | ||
| let unprefixed_name = link_name.as_str().strip_prefix("llvm.x86.sse3.").unwrap(); | ||
|
|
||
| match unprefixed_name { | ||
| // Used to implement the _mm_addsub_ps and _mm_addsub_pd functions. | ||
| // Alternatingly add and subtract floating point (f32 or f64) from | ||
| // `left` and `right` | ||
| "addsub.ps" | "addsub.pd" => { | ||
| let [left, right] = | ||
| this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; | ||
|
|
||
| let (left, left_len) = this.operand_to_simd(left)?; | ||
| let (right, right_len) = this.operand_to_simd(right)?; | ||
| let (dest, dest_len) = this.place_to_simd(dest)?; | ||
|
|
||
| assert_eq!(dest_len, left_len); | ||
| assert_eq!(dest_len, right_len); | ||
|
|
||
| for i in 0..dest_len { | ||
| let left = this.read_immediate(&this.project_index(&left, i)?)?; | ||
| let right = this.read_immediate(&this.project_index(&right, i)?)?; | ||
| let dest = this.project_index(&dest, i)?; | ||
|
|
||
| // Even elements are subtracted and odd elements are added. | ||
| let op = if i % 2 == 0 { mir::BinOp::Sub } else { mir::BinOp::Add }; | ||
| let res = this.wrapping_binary_op(op, &left, &right)?; | ||
|
|
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| this.write_immediate(*res, &dest)?; | ||
| } | ||
| } | ||
| // Used to implement the _mm_h{add,sub}_p{s,d} functions. | ||
| // Horizontally add/subtract adjacent floating point values | ||
| // in `left` and `right`. | ||
| "hadd.ps" | "hadd.pd" | "hsub.ps" | "hsub.pd" => { | ||
| let [left, right] = | ||
| this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; | ||
|
|
||
| let which = match unprefixed_name { | ||
| "hadd.ps" | "hadd.pd" => mir::BinOp::Add, | ||
| "hsub.ps" | "hsub.pd" => mir::BinOp::Sub, | ||
| _ => unreachable!(), | ||
| }; | ||
|
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||
| horizontal_bin_op(this, which, /*saturating*/ false, left, right, dest)?; | ||
| } | ||
| // Used to implement the _mm_lddqu_si128 function. | ||
| // Reads a 128-bit vector from an unaligned pointer. This intrinsic | ||
| // is expected to perform better than a regular unaligned read when | ||
| // the data crosses a cache line, but for Miri this is just a regular | ||
| // unaligned read. | ||
| "ldu.dq" => { | ||
| let [src_ptr] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; | ||
| let src_ptr = this.read_pointer(src_ptr)?; | ||
| let dest = dest.force_mplace(this)?; | ||
|
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||
| this.mem_copy( | ||
| src_ptr, | ||
| Align::ONE, | ||
| dest.ptr(), | ||
| Align::ONE, | ||
| dest.layout.size, | ||
| /*nonoverlapping*/ true, | ||
| )?; | ||
| } | ||
| _ => return Ok(EmulateByNameResult::NotSupported), | ||
| } | ||
| Ok(EmulateByNameResult::NeedsJumping) | ||
| } | ||
| } |
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