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[mips][microMIPS] Implement NOP aliases

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This patch implements microMIPS 16-bit (MOVE16 $0, $0) and
32-bit (SLL $0, $0, 0) NOP aliases.

http://reviews.llvm.org/D6440


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222953 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jozef Kolek 2014-11-29 13:29:24 +00:00
parent c7d3454376
commit b087448a5f
7 changed files with 26 additions and 11 deletions
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3
lib/Target/Mips/MCTargetDesc/MipsMCCodeEmitter.cpp
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@ -173,7 +173,8 @@ EncodeInstruction(const MCInst &MI, raw_ostream &OS,
// Unfortunately in MIPS both NOP and SLL will come in with Binary == 0
// so we have to special check for them.
unsigned Opcode = TmpInst.getOpcode();
if ((Opcode != Mips::NOP) && (Opcode != Mips::SLL) && !Binary)
if ((Opcode != Mips::NOP) && (Opcode != Mips::SLL) &&
(Opcode != Mips::SLL_MM) && !Binary)
llvm_unreachable("unimplemented opcode in EncodeInstruction()");
if (STI.getFeatureBits() & Mips::FeatureMicroMips) {

2
lib/Target/Mips/MicroMipsInstrInfo.td
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@ -710,4 +710,6 @@ def : MipsPat<(srl GPR32:$src, immZExt5:$imm),
//===----------------------------------------------------------------------===//
def : MipsInstAlias<"wait", (WAIT_MM 0x0), 1>;
def : MipsInstAlias<"nop", (SLL_MM ZERO, ZERO, 0), 1>;
def : MipsInstAlias<"nop", (MOVE16_MM ZERO, ZERO), 1>;
}

6
test/MC/Disassembler/Mips/micromips.txt
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@ -322,6 +322,9 @@
# CHECK: swm32 $16, $17, 8($4)
0x20 0x44 0xd0 0x08
# CHECK: nop
0x00 0x00 0x00 0x00
# CHECK: addu16 $6, $17, $4
0x07 0x42
@ -408,3 +411,6 @@
# CHECK: addius5 $7, -2
0x4c 0xfc
# CHECK: nop
0x0c 0x00

6
test/MC/Disassembler/Mips/micromips_le.txt
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@ -322,6 +322,9 @@
# CHECK: swm32 $16, $17, 8($4)
0x44 0x20 0x08 0xd0
# CHECK: nop
0x00 0x00 0x00 0x00
# CHECK: addu16 $6, $17, $4
0x42 0x07
@ -408,3 +411,6 @@
# CHECK: addius5 $7, -2
0xfc 0x4c
# CHECK: nop
0x00 0x0c

4
test/MC/Mips/micromips-16-bit-instructions.s
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@ -40,7 +40,7 @@
# CHECK-NEXT: jalr $9 # encoding: [0xc9,0x45]
# CHECK-EL: jraddiusp 20 # encoding: [0x05,0x47]
# CHECK-NEXT: jalrs16 $9 # encoding: [0xe9,0x45]
# CHECK-EL: move $zero, $zero # encoding: [0x00,0x0c]
# CHECK-EL: nop # encoding: [0x00,0x0c]
# CHECK-EL: jr16 $9 # encoding: [0x89,0x45]
# CHECK-EL: nop # encoding: [0x00,0x00,0x00,0x00]
# CHECK-EL: break16 8 # encoding: [0x88,0x46]
@ -79,7 +79,7 @@
# CHECK-NEXT: jalr $9 # encoding: [0x45,0xc9]
# CHECK-EB: jraddiusp 20 # encoding: [0x47,0x05]
# CHECK-NEXT: jalrs16 $9 # encoding: [0x45,0xe9]
# CHECK-EB: move $zero, $zero # encoding: [0x0c,0x00]
# CHECK-EB: nop # encoding: [0x0c,0x00]
# CHECK-EB: jr16 $9 # encoding: [0x45,0x89]
# CHECK-EB: nop # encoding: [0x00,0x00,0x00,0x00]
# CHECK-EB: break16 8 # encoding: [0x46,0x88]

8
test/MC/Mips/micromips-branch-instructions.s
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@ -30,9 +30,9 @@
# CHECK-EL: bltz $6, 1332 # encoding: [0x06,0x40,0x9a,0x02]
# CHECK-EL: nop # encoding: [0x00,0x00,0x00,0x00]
# CHECK-EL: bgezals $6, 1332 # encoding: [0x66,0x42,0x9a,0x02]
# CHECK-EL: move $zero, $zero # encoding: [0x00,0x0c]
# CHECK-EL: nop # encoding: [0x00,0x0c]
# CHECK-EL: bltzals $6, 1332 # encoding: [0x26,0x42,0x9a,0x02]
# CHECK-EL: move $zero, $zero # encoding: [0x00,0x0c]
# CHECK-EL: nop # encoding: [0x00,0x0c]
#------------------------------------------------------------------------------
# Big endian
#------------------------------------------------------------------------------
@ -57,9 +57,9 @@
# CHECK-EB: bltz $6, 1332 # encoding: [0x40,0x06,0x02,0x9a]
# CHECK-EB: nop # encoding: [0x00,0x00,0x00,0x00]
# CHECK-EB: bgezals $6, 1332 # encoding: [0x42,0x66,0x02,0x9a]
# CHECK-EB: move $zero, $zero # encoding: [0x0c,0x00]
# CHECK-EB: nop # encoding: [0x0c,0x00]
# CHECK-EB: bltzals $6, 1332 # encoding: [0x42,0x26,0x02,0x9a]
# CHECK-EB: move $zero, $zero # encoding: [0x0c,0x00]
# CHECK-EB: nop # encoding: [0x0c,0x00]
b 1332
beq $9,$6,1332

8
test/MC/Mips/micromips-jump-instructions.s
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@ -20,9 +20,9 @@
# CHECK-EL: jr $7 # encoding: [0x07,0x00,0x3c,0x0f]
# CHECK-EL: nop # encoding: [0x00,0x00,0x00,0x00]
# CHECK-EL: jals 1328 # encoding: [0x00,0x74,0x98,0x02]
# CHECK-EL: move $zero, $zero # encoding: [0x00,0x0c]
# CHECK-EL: nop # encoding: [0x00,0x0c]
# CHECK-EL: jalrs $ra, $6 # encoding: [0xe6,0x03,0x3c,0x4f]
# CHECK-EL: move $zero, $zero # encoding: [0x00,0x0c]
# CHECK-EL: nop # encoding: [0x00,0x0c]
#------------------------------------------------------------------------------
# Big endian
#------------------------------------------------------------------------------
@ -37,9 +37,9 @@
# CHECK-EB: jr $7 # encoding: [0x00,0x07,0x0f,0x3c]
# CHECK-EB: nop # encoding: [0x00,0x00,0x00,0x00]
# CHECK-EB: jals 1328 # encoding: [0x74,0x00,0x02,0x98]
# CHECK-EB: move $zero, $zero # encoding: [0x0c,0x00]
# CHECK-EB: nop # encoding: [0x0c,0x00]
# CHECK-EB: jalrs $ra, $6 # encoding: [0x03,0xe6,0x4f,0x3c]
# CHECK-EB: move $zero, $zero # encoding: [0x0c,0x00]
# CHECK-EB: nop # encoding: [0x0c,0x00]
j 1328
jal 1328