Merge pull request #3428 from bjorn3/fix_cranelift_codegen_benches

Fix cranelift-codegen benches

cranelift/codegen/benches/x64-evex-encoding.rs

@@ -5,12 +5,9 @@
 #[cfg(feature = "x86")]
 mod x86 {
     use cranelift_codegen::isa::x64::encoding::{
-        evex::{EvexContext, EvexInstruction, EvexMasking, EvexVectorLength, Register},
-        rex::OpcodeMap,
-        rex::{encode_modrm, LegacyPrefixes},
-        ByteSink,
+        evex::{EvexInstruction, EvexVectorLength, Register},
+        rex::{LegacyPrefixes, OpcodeMap},
     };
-    use cranelift_codegen_shared::isa::x86::EncodingBits;
     use criterion::{criterion_group, Criterion};
 
     // Define the benchmarks.
@@ -34,26 +31,6 @@ mod x86 {
                     .encode(&mut sink);
             });
         });
-
-        group.bench_function("encode_evex (function pattern)", |b| {
-            let mut sink = vec![];
-            let bits = EncodingBits::new(&[0x66, 0x0f, 0x38, 0x1f], 0, 1);
-            let vvvvv = Register::from(0);
-            b.iter(|| {
-                sink.clear();
-                encode_evex(
-                    bits,
-                    rax,
-                    vvvvv,
-                    rdx,
-                    EvexContext::Other {
-                        length: EvexVectorLength::V128,
-                    },
-                    EvexMasking::default(),
-                    &mut sink,
-                );
-            })
-        });
     }
     criterion_group!(benches, x64_evex_encoding_benchmarks);
 
@@ -65,66 +42,6 @@ mod x86 {
         benches();
         Criterion::default().configure_from_args().final_summary();
     }
-
-    /// From the legacy x86 backend: a mechanism for encoding an EVEX
-    /// instruction, including the prefixes, the instruction opcode, and the
-    /// ModRM byte. This EVEX encoding function only encodes the `reg` (operand
-    /// 1), `vvvv` (operand 2), `rm` (operand 3) form; other forms are possible
-    /// (see section 2.6.2, Intel Software Development Manual, volume 2A),
-    /// requiring refactoring of this function or separate functions for each
-    /// form (e.g. as for the REX prefix).
-    #[inline(always)]
-    pub fn encode_evex<CS: ByteSink + ?Sized>(
-        enc: EncodingBits,
-        reg: Register,
-        vvvvv: Register,
-        rm: Register,
-        context: EvexContext,
-        masking: EvexMasking,
-        sink: &mut CS,
-    ) {
-        let reg: u8 = reg.into();
-        let rm: u8 = rm.into();
-        let vvvvv: u8 = vvvvv.into();
-
-        // EVEX prefix.
-        sink.put1(0x62);
-
-        debug_assert!(enc.mm() < 0b100);
-        let mut p0 = enc.mm() & 0b11;
-        p0 |= evex2(rm, reg) << 4; // bits 3:2 are always unset
-        sink.put1(p0);
-
-        let mut p1 = enc.pp() | 0b100; // bit 2 is always set
-        p1 |= (!(vvvvv) & 0b1111) << 3;
-        p1 |= (enc.rex_w() & 0b1) << 7;
-        sink.put1(p1);
-
-        let mut p2 = masking.aaa_bits();
-        p2 |= (!(vvvvv >> 4) & 0b1) << 3;
-        p2 |= context.bits() << 4;
-        p2 |= masking.z_bit() << 7;
-        sink.put1(p2);
-
-        // Opcode.
-        sink.put1(enc.opcode_byte());
-
-        // ModR/M byte.
-        sink.put1(encode_modrm(3, reg & 7, rm & 7))
-    }
-
-    /// From the legacy x86 backend: encode the RXBR' bits of the EVEX P0 byte.
-    /// For an explanation of these bits, see section 2.6.1 in the Intel
-    /// Software Development Manual, volume 2A. These bits can be used by
-    /// different addressing modes (see section 2.6.2), requiring different
-    /// `vex*` functions than this one.
-    fn evex2(rm: u8, reg: u8) -> u8 {
-        let b = !(rm >> 3) & 1;
-        let x = !(rm >> 4) & 1;
-        let r = !(reg >> 3) & 1;
-        let r_ = !(reg >> 4) & 1;
-        0x00 | r_ | (b << 1) | (x << 2) | (r << 3)
-    }
 }
 
 fn main() {