| //===-- X86InstrExtension.td - Sign and Zero Extensions ----*- tablegen -*-===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file describes the sign and zero extension operations. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| let hasSideEffects = 0 in { |
| let Defs = [AX], Uses = [AL] in // AX = signext(AL) |
| def CBW : I<0x98, RawFrm, (outs), (ins), |
| "{cbtw|cbw}", []>, OpSize16, Sched<[WriteALU]>; |
| let Defs = [EAX], Uses = [AX] in // EAX = signext(AX) |
| def CWDE : I<0x98, RawFrm, (outs), (ins), |
| "{cwtl|cwde}", []>, OpSize32, Sched<[WriteALU]>; |
| let Defs = [RAX], Uses = [EAX] in // RAX = signext(EAX) |
| def CDQE : RI<0x98, RawFrm, (outs), (ins), |
| "{cltq|cdqe}", []>, Sched<[WriteALU]>, Requires<[In64BitMode]>; |
| |
| // FIXME: CWD/CDQ/CQO shouldn't Def the A register, but the fast register |
| // allocator crashes if you remove it. |
| let Defs = [AX,DX], Uses = [AX] in // DX:AX = signext(AX) |
| def CWD : I<0x99, RawFrm, (outs), (ins), |
| "{cwtd|cwd}", []>, OpSize16, Sched<[WriteALU]>; |
| let Defs = [EAX,EDX], Uses = [EAX] in // EDX:EAX = signext(EAX) |
| def CDQ : I<0x99, RawFrm, (outs), (ins), |
| "{cltd|cdq}", []>, OpSize32, Sched<[WriteALU]>; |
| let Defs = [RAX,RDX], Uses = [RAX] in // RDX:RAX = signext(RAX) |
| def CQO : RI<0x99, RawFrm, (outs), (ins), |
| "{cqto|cqo}", []>, Sched<[WriteALU]>, Requires<[In64BitMode]>; |
| } |
| |
| // Sign/Zero extenders |
| let hasSideEffects = 0 in { |
| def MOVSX16rr8 : I<0xBE, MRMSrcReg, (outs GR16:$dst), (ins GR8:$src), |
| "movs{bw|x}\t{$src, $dst|$dst, $src}", []>, |
| TB, OpSize16, Sched<[WriteALU]>; |
| let mayLoad = 1 in |
| def MOVSX16rm8 : I<0xBE, MRMSrcMem, (outs GR16:$dst), (ins i8mem:$src), |
| "movs{bw|x}\t{$src, $dst|$dst, $src}", []>, |
| TB, OpSize16, Sched<[WriteALULd]>; |
| } // hasSideEffects = 0 |
| def MOVSX32rr8 : I<0xBE, MRMSrcReg, (outs GR32:$dst), (ins GR8:$src), |
| "movs{bl|x}\t{$src, $dst|$dst, $src}", |
| [(set GR32:$dst, (sext GR8:$src))]>, TB, |
| OpSize32, Sched<[WriteALU]>; |
| def MOVSX32rm8 : I<0xBE, MRMSrcMem, (outs GR32:$dst), (ins i8mem :$src), |
| "movs{bl|x}\t{$src, $dst|$dst, $src}", |
| [(set GR32:$dst, (sextloadi32i8 addr:$src))]>, TB, |
| OpSize32, Sched<[WriteALULd]>; |
| def MOVSX32rr16: I<0xBF, MRMSrcReg, (outs GR32:$dst), (ins GR16:$src), |
| "movs{wl|x}\t{$src, $dst|$dst, $src}", |
| [(set GR32:$dst, (sext GR16:$src))]>, TB, |
| OpSize32, Sched<[WriteALU]>; |
| def MOVSX32rm16: I<0xBF, MRMSrcMem, (outs GR32:$dst), (ins i16mem:$src), |
| "movs{wl|x}\t{$src, $dst|$dst, $src}", |
| [(set GR32:$dst, (sextloadi32i16 addr:$src))]>, |
| OpSize32, TB, Sched<[WriteALULd]>; |
| |
| let hasSideEffects = 0 in { |
| def MOVZX16rr8 : I<0xB6, MRMSrcReg, (outs GR16:$dst), (ins GR8:$src), |
| "movz{bw|x}\t{$src, $dst|$dst, $src}", []>, |
| TB, OpSize16, Sched<[WriteALU]>; |
| let mayLoad = 1 in |
| def MOVZX16rm8 : I<0xB6, MRMSrcMem, (outs GR16:$dst), (ins i8mem:$src), |
| "movz{bw|x}\t{$src, $dst|$dst, $src}", []>, |
| TB, OpSize16, Sched<[WriteALULd]>; |
| } // hasSideEffects = 0 |
| def MOVZX32rr8 : I<0xB6, MRMSrcReg, (outs GR32:$dst), (ins GR8 :$src), |
| "movz{bl|x}\t{$src, $dst|$dst, $src}", |
| [(set GR32:$dst, (zext GR8:$src))]>, TB, |
| OpSize32, Sched<[WriteALU]>; |
| def MOVZX32rm8 : I<0xB6, MRMSrcMem, (outs GR32:$dst), (ins i8mem :$src), |
| "movz{bl|x}\t{$src, $dst|$dst, $src}", |
| [(set GR32:$dst, (zextloadi32i8 addr:$src))]>, TB, |
| OpSize32, Sched<[WriteALULd]>; |
| def MOVZX32rr16: I<0xB7, MRMSrcReg, (outs GR32:$dst), (ins GR16:$src), |
| "movz{wl|x}\t{$src, $dst|$dst, $src}", |
| [(set GR32:$dst, (zext GR16:$src))]>, TB, |
| OpSize32, Sched<[WriteALU]>; |
| def MOVZX32rm16: I<0xB7, MRMSrcMem, (outs GR32:$dst), (ins i16mem:$src), |
| "movz{wl|x}\t{$src, $dst|$dst, $src}", |
| [(set GR32:$dst, (zextloadi32i16 addr:$src))]>, |
| TB, OpSize32, Sched<[WriteALULd]>; |
| |
| // These instructions exist as a consequence of operand size prefix having |
| // control of the destination size, but not the input size. Only support them |
| // for the disassembler. |
| let isCodeGenOnly = 1, ForceDisassemble = 1, hasSideEffects = 0 in { |
| def MOVSX16rr16: I<0xBF, MRMSrcReg, (outs GR16:$dst), (ins GR16:$src), |
| "movs{ww|x}\t{$src, $dst|$dst, $src}", |
| []>, TB, OpSize16, Sched<[WriteALU]>, NotMemoryFoldable; |
| def MOVZX16rr16: I<0xB7, MRMSrcReg, (outs GR16:$dst), (ins GR16:$src), |
| "movz{ww|x}\t{$src, $dst|$dst, $src}", |
| []>, TB, OpSize16, Sched<[WriteALU]>, NotMemoryFoldable; |
| let mayLoad = 1 in { |
| def MOVSX16rm16: I<0xBF, MRMSrcMem, (outs GR16:$dst), (ins i16mem:$src), |
| "movs{ww|x}\t{$src, $dst|$dst, $src}", |
| []>, OpSize16, TB, Sched<[WriteALULd]>, NotMemoryFoldable; |
| def MOVZX16rm16: I<0xB7, MRMSrcMem, (outs GR16:$dst), (ins i16mem:$src), |
| "movz{ww|x}\t{$src, $dst|$dst, $src}", |
| []>, TB, OpSize16, Sched<[WriteALULd]>, NotMemoryFoldable; |
| } // mayLoad = 1 |
| } // isCodeGenOnly = 1, ForceDisassemble = 1, hasSideEffects = 0 |
| |
| // These are the same as the regular MOVZX32rr8 and MOVZX32rm8 |
| // except that they use GR32_NOREX for the output operand register class |
| // instead of GR32. This allows them to operate on h registers on x86-64. |
| let hasSideEffects = 0, isCodeGenOnly = 1 in { |
| def MOVZX32rr8_NOREX : I<0xB6, MRMSrcReg, |
| (outs GR32_NOREX:$dst), (ins GR8_NOREX:$src), |
| "movz{bl|x}\t{$src, $dst|$dst, $src}", |
| []>, TB, OpSize32, Sched<[WriteALU]>; |
| let mayLoad = 1 in |
| def MOVZX32rm8_NOREX : I<0xB6, MRMSrcMem, |
| (outs GR32_NOREX:$dst), (ins i8mem_NOREX:$src), |
| "movz{bl|x}\t{$src, $dst|$dst, $src}", |
| []>, TB, OpSize32, Sched<[WriteALULd]>; |
| |
| def MOVSX32rr8_NOREX : I<0xBE, MRMSrcReg, |
| (outs GR32_NOREX:$dst), (ins GR8_NOREX:$src), |
| "movs{bl|x}\t{$src, $dst|$dst, $src}", |
| []>, TB, OpSize32, Sched<[WriteALU]>; |
| let mayLoad = 1 in |
| def MOVSX32rm8_NOREX : I<0xBE, MRMSrcMem, |
| (outs GR32_NOREX:$dst), (ins i8mem_NOREX:$src), |
| "movs{bl|x}\t{$src, $dst|$dst, $src}", |
| []>, TB, OpSize32, Sched<[WriteALULd]>; |
| } |
| |
| // MOVSX64rr8 always has a REX prefix and it has an 8-bit register |
| // operand, which makes it a rare instruction with an 8-bit register |
| // operand that can never access an h register. If support for h registers |
| // were generalized, this would require a special register class. |
| def MOVSX64rr8 : RI<0xBE, MRMSrcReg, (outs GR64:$dst), (ins GR8 :$src), |
| "movs{bq|x}\t{$src, $dst|$dst, $src}", |
| [(set GR64:$dst, (sext GR8:$src))]>, TB, |
| Sched<[WriteALU]>; |
| def MOVSX64rm8 : RI<0xBE, MRMSrcMem, (outs GR64:$dst), (ins i8mem :$src), |
| "movs{bq|x}\t{$src, $dst|$dst, $src}", |
| [(set GR64:$dst, (sextloadi64i8 addr:$src))]>, |
| TB, Sched<[WriteALULd]>; |
| def MOVSX64rr16: RI<0xBF, MRMSrcReg, (outs GR64:$dst), (ins GR16:$src), |
| "movs{wq|x}\t{$src, $dst|$dst, $src}", |
| [(set GR64:$dst, (sext GR16:$src))]>, TB, |
| Sched<[WriteALU]>; |
| def MOVSX64rm16: RI<0xBF, MRMSrcMem, (outs GR64:$dst), (ins i16mem:$src), |
| "movs{wq|x}\t{$src, $dst|$dst, $src}", |
| [(set GR64:$dst, (sextloadi64i16 addr:$src))]>, |
| TB, Sched<[WriteALULd]>; |
| def MOVSX64rr32: RI<0x63, MRMSrcReg, (outs GR64:$dst), (ins GR32:$src), |
| "movs{lq|xd}\t{$src, $dst|$dst, $src}", |
| [(set GR64:$dst, (sext GR32:$src))]>, |
| Sched<[WriteALU]>, Requires<[In64BitMode]>; |
| def MOVSX64rm32: RI<0x63, MRMSrcMem, (outs GR64:$dst), (ins i32mem:$src), |
| "movs{lq|xd}\t{$src, $dst|$dst, $src}", |
| [(set GR64:$dst, (sextloadi64i32 addr:$src))]>, |
| Sched<[WriteALULd]>, Requires<[In64BitMode]>; |
| |
| // These instructions exist as a consequence of operand size prefix having |
| // control of the destination size, but not the input size. Only support them |
| // for the disassembler. |
| let isCodeGenOnly = 1, ForceDisassemble = 1, hasSideEffects = 0 in { |
| def MOVSX16rr32: I<0x63, MRMSrcReg, (outs GR16:$dst), (ins GR32:$src), |
| "movs{lq|xd}\t{$src, $dst|$dst, $src}", []>, |
| Sched<[WriteALU]>, OpSize16, Requires<[In64BitMode]>; |
| def MOVSX32rr32: I<0x63, MRMSrcReg, (outs GR32:$dst), (ins GR32:$src), |
| "movs{lq|xd}\t{$src, $dst|$dst, $src}", []>, |
| Sched<[WriteALU]>, OpSize32, Requires<[In64BitMode]>; |
| let mayLoad = 1 in { |
| def MOVSX16rm32: I<0x63, MRMSrcMem, (outs GR16:$dst), (ins i32mem:$src), |
| "movs{lq|xd}\t{$src, $dst|$dst, $src}", []>, |
| Sched<[WriteALULd]>, OpSize16, Requires<[In64BitMode]>; |
| def MOVSX32rm32: I<0x63, MRMSrcMem, (outs GR32:$dst), (ins i32mem:$src), |
| "movs{lq|xd}\t{$src, $dst|$dst, $src}", []>, |
| Sched<[WriteALULd]>, OpSize32, Requires<[In64BitMode]>; |
| } // mayLoad = 1 |
| } // isCodeGenOnly = 1, ForceDisassemble = 1, hasSideEffects = 0 |
| |
| // movzbq and movzwq encodings for the disassembler |
| let hasSideEffects = 0 in { |
| def MOVZX64rr8 : RI<0xB6, MRMSrcReg, (outs GR64:$dst), (ins GR8:$src), |
| "movz{bq|x}\t{$src, $dst|$dst, $src}", []>, |
| TB, Sched<[WriteALU]>; |
| let mayLoad = 1 in |
| def MOVZX64rm8 : RI<0xB6, MRMSrcMem, (outs GR64:$dst), (ins i8mem:$src), |
| "movz{bq|x}\t{$src, $dst|$dst, $src}", []>, |
| TB, Sched<[WriteALULd]>; |
| def MOVZX64rr16 : RI<0xB7, MRMSrcReg, (outs GR64:$dst), (ins GR16:$src), |
| "movz{wq|x}\t{$src, $dst|$dst, $src}", []>, |
| TB, Sched<[WriteALU]>; |
| let mayLoad = 1 in |
| def MOVZX64rm16 : RI<0xB7, MRMSrcMem, (outs GR64:$dst), (ins i16mem:$src), |
| "movz{wq|x}\t{$src, $dst|$dst, $src}", []>, |
| TB, Sched<[WriteALULd]>; |
| } |
| |
| // 64-bit zero-extension patterns use SUBREG_TO_REG and an operation writing a |
| // 32-bit register. |
| def : Pat<(i64 (zext GR8:$src)), |
| (SUBREG_TO_REG (i64 0), (MOVZX32rr8 GR8:$src), sub_32bit)>; |
| def : Pat<(zextloadi64i8 addr:$src), |
| (SUBREG_TO_REG (i64 0), (MOVZX32rm8 addr:$src), sub_32bit)>; |
| |
| def : Pat<(i64 (zext GR16:$src)), |
| (SUBREG_TO_REG (i64 0), (MOVZX32rr16 GR16:$src), sub_32bit)>; |
| def : Pat<(zextloadi64i16 addr:$src), |
| (SUBREG_TO_REG (i64 0), (MOVZX32rm16 addr:$src), sub_32bit)>; |
| |
| // The preferred way to do 32-bit-to-64-bit zero extension on x86-64 is to use a |
| // SUBREG_TO_REG to utilize implicit zero-extension, however this isn't possible |
| // when the 32-bit value is defined by a truncate or is copied from something |
| // where the high bits aren't necessarily all zero. In such cases, we fall back |
| // to these explicit zext instructions. |
| def : Pat<(i64 (zext GR32:$src)), |
| (SUBREG_TO_REG (i64 0), (MOV32rr GR32:$src), sub_32bit)>; |
| def : Pat<(i64 (zextloadi64i32 addr:$src)), |
| (SUBREG_TO_REG (i64 0), (MOV32rm addr:$src), sub_32bit)>; |
