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arm-asm: Support rotation for sxtb, sxth, uxtb, uxth

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Danny Milosavljevic 2020-12-27 15:04:19 +01:00
parent daaa88ce68
commit 49365d563e
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GPG key ID: E71A35542C30BAA5
1 changed files with 41 additions and 10 deletions
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51
arm-asm.c
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@ -201,6 +201,9 @@ static void asm_unary_opcode(TCCState *s1, int token)
static void asm_binary_opcode(TCCState *s1, int token)
{
Operand ops[2];
Operand rotation;
uint32_t encoded_rotation = 0;
uint64_t amount;
parse_operand(s1, &ops[0]);
if (tok == ',')
next();
@ -212,27 +215,55 @@ static void asm_binary_opcode(TCCState *s1, int token)
return;
}
if (ops[1].type != OP_REG32)
if (ops[1].type != OP_REG32) {
expect("(source operand) register");
else switch (ARM_INSTRUCTION_GROUP(token)) {
return;
}
if (tok == ',') {
next(); // skip ','
if (tok == TOK_ASM_ror) {
next(); // skip 'ror'
parse_operand(s1, &rotation);
if (rotation.type != OP_IM8) {
expect("immediate value for rotation");
return;
} else {
amount = rotation.e.v;
switch (amount) {
case 8:
encoded_rotation = 1 << 10;
break;
case 16:
encoded_rotation = 2 << 10;
break;
case 24:
encoded_rotation = 3 << 10;
break;
default:
expect("'8' or '16' or '24'");
return;
}
}
}
}
switch (ARM_INSTRUCTION_GROUP(token)) {
case TOK_ASM_clzeq:
if (encoded_rotation)
tcc_error("clz does not support rotation");
asm_emit_opcode(token, 0x16f0f10 | (ops[0].reg << 12) | ops[1].reg);
break;
case TOK_ASM_sxtbeq:
/* TODO: optional ROR (8|16|24) */
asm_emit_opcode(token, 0x6af0070 | (ops[0].reg << 12) | ops[1].reg);
asm_emit_opcode(token, 0x6af0070 | (ops[0].reg << 12) | ops[1].reg | encoded_rotation);
break;
case TOK_ASM_sxtheq:
/* TODO: optional ROR (8|16|24) */
asm_emit_opcode(token, 0x6bf0070 | (ops[0].reg << 12) | ops[1].reg);
asm_emit_opcode(token, 0x6bf0070 | (ops[0].reg << 12) | ops[1].reg | encoded_rotation);
break;
case TOK_ASM_uxtbeq:
/* TODO: optional ROR (8|16|24) */
asm_emit_opcode(token, 0x6ef0070 | (ops[0].reg << 12) | ops[1].reg);
asm_emit_opcode(token, 0x6ef0070 | (ops[0].reg << 12) | ops[1].reg | encoded_rotation);
break;
case TOK_ASM_uxtheq:
/* TODO: optional ROR (8|16|24) */
asm_emit_opcode(token, 0x6ff0070 | (ops[0].reg << 12) | ops[1].reg);
asm_emit_opcode(token, 0x6ff0070 | (ops[0].reg << 12) | ops[1].reg | encoded_rotation);
break;
default:
expect("binary instruction");