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PowerPC: Corrected DIVW divide-by-zero crashes, flags, and corner-case results [R. Belmont]

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R. Belmont 2012-03-11 16:09:16 +00:00
parent d0dc1c8b58
commit b1847da7dc
1 changed files with 37 additions and 3 deletions
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40
src/emu/cpu/powerpc/ppcdrc.c
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@ -3072,10 +3072,44 @@ static int generate_instruction_1f(powerpc_state *ppc, drcuml_block *block, comp
return TRUE;
case 0x1eb: /* DIVWx */
case 0x3eb: /* DIVWOx */
case 0x3eb: /* DIVWOx */
UML_CMP(block, R32(G_RB(op)), 0x0); // cmp rb, #0
UML_JMPc(block, COND_NE, compiler->labelnum); // bne 0:
UML_CMP(block, R32(G_RA(op)), 0x80000000); // cmp rb, #80000000
UML_JMPc(block, COND_AE, compiler->labelnum); // bae 0:
UML_MOV(block, R32(G_RD(op)), 0x0); // move rd, #0
if (op & M_OE)
{
UML_OR(block, XERSO32, XERSO32, 0x1); // SO = 1
}
UML_JMP(block, compiler->labelnum+3); // jmp 3:
UML_LABEL(block, compiler->labelnum++); // 0:
UML_CMP(block, R32(G_RB(op)), 0x0); // cmp rb, #0
UML_JMPc(block, COND_Z, compiler->labelnum); // beq 1:
UML_CMP(block, R32(G_RB(op)), 0xffffffff); // cmp rb, #ffffffff
UML_JMPc(block, COND_NE, compiler->labelnum+1); // bne 2:
UML_CMP(block, R32(G_RA(op)), 0x80000000); // cmp ra, #80000000
UML_JMPc(block, COND_NE, compiler->labelnum+1); // bne 2:
UML_LABEL(block, compiler->labelnum++); // 1:
// do second branch
UML_MOV(block, R32(G_RD(op)), 0xffffffff); // move rd, #ffffffff
if (op & M_OE)
{
UML_OR(block, XERSO32, XERSO32, 0x1); // SO = 1
}
UML_JMP(block, compiler->labelnum+1); // jmp 3:
UML_LABEL(block, compiler->labelnum++); // 2:
UML_DIVS(block, R32(G_RD(op)), R32(G_RD(op)), R32(G_RA(op)), R32(G_RB(op))); // divs rd,rd,ra,rb
generate_compute_flags(ppc, block, desc, op & M_RC, ((op & M_OE) ? XER_OV : 0), FALSE);// <update flags>
return TRUE;
generate_compute_flags(ppc, block, desc, op & M_RC, ((op & M_OE) ? XER_OV : 0), FALSE);// <update flags>
UML_LABEL(block, compiler->labelnum++); // 3:
return TRUE;
case 0x01c: /* ANDx */
UML_AND(block, R32(G_RA(op)), R32(G_RS(op)), R32(G_RB(op))); // and ra,rs,rb