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-rw-r--r--src/long_mode/mod.rs49
1 files changed, 48 insertions, 1 deletions
diff --git a/src/long_mode/mod.rs b/src/long_mode/mod.rs
index 8ce4535..d22db30 100644
--- a/src/long_mode/mod.rs
+++ b/src/long_mode/mod.rs
@@ -6414,6 +6414,51 @@ impl fmt::Display for FieldDescription {
}
}
+fn read_opc_hotpath<
+ T: Reader<<Arch as yaxpeax_arch::Arch>::Address, <Arch as yaxpeax_arch::Arch>::Word>,
+ S: DescriptionSink<FieldDescription>,
+>(mut b: u8, mut record: OpcodeRecord, nextb: &mut u8, next_rec: &mut OpcodeRecord, words: &mut T, instruction: &mut Instruction, sink: &mut S) -> Result<Option<OperandCode>, DecodeError> {
+ if b >= 0x40 && b < 0x50 {
+ sink.record((words.offset() - 1) as u32 * 8, (words.offset() - 1) as u32 * 8 + 7, FieldDescription {
+ desc: InnerDescription::RexPrefix(b),
+ id: words.offset() as u32 * 8 - 8,
+ });
+ b = words.next().ok().ok_or(DecodeError::ExhaustedInput)?;
+ record = unsafe {
+ core::ptr::read_volatile(&OPCODES[b as usize])
+ };
+ instruction.prefixes.rex_from(b);
+ }
+
+ if let Interpretation::Instruction(opc) = record.0 {
+ if words.offset() > 1 {
+ sink.record(
+ words.offset() as u32 * 8 - 8 - 1, words.offset() as u32 * 8 - 8 - 1,
+ InnerDescription::Boundary("prefixes end")
+ .with_id(words.offset() as u32 * 8 - 9)
+ );
+ }
+ if opc != Opcode::Invalid {
+ sink.record((words.offset() - 1) as u32 * 8, (words.offset() - 1) as u32 * 8 + 7, FieldDescription {
+ desc: InnerDescription::Opcode(opc),
+ id: words.offset() as u32 * 8 - 8,
+ });
+ }
+ sink.record((words.offset() - 1) as u32 * 8, (words.offset() - 1) as u32 * 8 + 7, FieldDescription {
+ desc: InnerDescription::OperandCode(OperandCodeWrapper { code: record.1 }),
+ id: words.offset() as u32 * 8 - 8 + 1,
+ });
+ instruction.mem_size = 0;
+ instruction.operand_count = 2;
+ instruction.opcode = opc;
+ return Ok(Some(record.1));
+ } else {
+ *nextb = b;
+ *next_rec = record;
+ return Ok(None);
+ }
+}
+
#[inline(always)]
fn read_with_annotations<
T: Reader<<Arch as yaxpeax_arch::Arch>::Address, <Arch as yaxpeax_arch::Arch>::Word>,
@@ -6429,7 +6474,9 @@ fn read_with_annotations<
// default operands to [RegRRR, Nothing, Nothing, Nothing]
instruction.operands = unsafe { core::mem::transmute(0x00_00_00_01) };
- let record: OperandCode = {
+ let record: OperandCode = if let Some(rec) = read_opc_hotpath(nextb, next_rec, &mut nextb, &mut next_rec, words, instruction, sink)? {
+ rec
+ } else {
let prefixes = &mut instruction.prefixes;
let record = loop {
let record = next_rec;