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| author | Shengchen Kan <shengchen.kan@intel.com> | 2023-11-23 16:17:17 +0800 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2023-11-23 16:17:17 +0800 |
| commit | a3cab1fa17ebf29b01fcb566648e2f3fb2955993 (patch) | |
| tree | 6888801e502e268b878e321e5f038fe36bfcf6cb /llvm/lib/Target/X86/Disassembler/X86Disassembler.cpp | |
| parent | d76d8e541dab6d65b2490957707341352eac8320 (diff) | |
| download | llvm-a3cab1fa17ebf29b01fcb566648e2f3fb2955993.zip llvm-a3cab1fa17ebf29b01fcb566648e2f3fb2955993.tar.gz llvm-a3cab1fa17ebf29b01fcb566648e2f3fb2955993.tar.bz2 | |
[X86][MC] Support encoding/decoding for PUSHP/POPP (#73092)
A PUSH and its corresponding POP may be marked with a 1-bit Push-Pop Acceleration (PPX)
hint to indicate that the POP reads the value written by the PUSH from the stack. The PPX hint
is encoded by setting REX2.W = 1 and is applicable only to PUSH with opcode 0x50+rd and POP
with opcode 0x58+rd in the legacy space. It is not applicable to any other variants of PUSH and POP.
Diffstat (limited to 'llvm/lib/Target/X86/Disassembler/X86Disassembler.cpp')
| -rw-r--r-- | llvm/lib/Target/X86/Disassembler/X86Disassembler.cpp | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/llvm/lib/Target/X86/Disassembler/X86Disassembler.cpp b/llvm/lib/Target/X86/Disassembler/X86Disassembler.cpp index 3e42499..d5218d3 100644 --- a/llvm/lib/Target/X86/Disassembler/X86Disassembler.cpp +++ b/llvm/lib/Target/X86/Disassembler/X86Disassembler.cpp @@ -1257,9 +1257,9 @@ static int getInstructionID(struct InternalInstruction *insn, attrMask &= ~ATTR_ADSIZE; } - // Absolute jump need special handling + // Absolute jump and pushp/popp need special handling if (insn->rex2ExtensionPrefix[0] == 0xd5 && insn->opcodeType == ONEBYTE && - insn->opcode == 0xA1) + (insn->opcode == 0xA1 || (insn->opcode & 0xf0) == 0x50)) attrMask |= ATTR_REX2; if (insn->mode == MODE_16BIT) { |