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author Ville Linde <villedevs@gmail.com>2016-03-12 01:38:23 +0200
committer Ville Linde <villedevs@gmail.com>2016-03-12 02:07:00 +0200
commita521d9a3cf3f35ee61dcc5378411b569e6d705aa (patch)
treebf28dba9f5847d837a9b61a19279f5ee385b440e /src/devices/cpu
parent2bf46f72eddb89a988de6e2adb8190ce328c9ae2 (diff)
ppcdrc: handle divide by zero (nw)
Diffstat (limited to 'src/devices/cpu')
-rw-r--r--src/devices/cpu/powerpc/ppcdrc.cpp14
1 files changed, 13 insertions, 1 deletions
diff --git a/src/devices/cpu/powerpc/ppcdrc.cpp b/src/devices/cpu/powerpc/ppcdrc.cpp
index 35b984d240d..7390f9284e9 100644
--- a/src/devices/cpu/powerpc/ppcdrc.cpp
+++ b/src/devices/cpu/powerpc/ppcdrc.cpp
@@ -3472,7 +3472,13 @@ int ppc_device::generate_instruction_3b(drcuml_block *block, compiler_state *com
case 0x12: /* FDIVSx */
if (!(m_drcoptions & PPCDRC_ACCURATE_SINGLES))
return generate_instruction_3f(block, compiler, desc);
- UML_FDDIV(block, F0, F64(G_RA(op)), F64(G_RB(op))); // fddiv f0,ra,rb
+ UML_FDCMP(block, F64(G_RB(op)), mem(&m_core->fp0)); // fdcmp rb,0
+ UML_JMPc(block, COND_Z, compiler->labelnum); // bz 1:
+ UML_FDDIV(block, F0, F64(G_RA(op)), F64(G_RB(op))); // fddiv f0,ra,rb
+ UML_JMP(block, compiler->labelnum+1); // bz 2:
+ UML_LABEL(block, compiler->labelnum++); // 1:
+ UML_FDMOV(block, F0, mem(&m_core->fp0)); // fdmov f0,0
+ UML_LABEL(block, compiler->labelnum++); // 2:
UML_FDRNDS(block, F64(G_RD(op)), F0); // fdrnds rd,f0
generate_fp_flags(block, desc, TRUE);
return TRUE;
@@ -3566,7 +3572,13 @@ int ppc_device::generate_instruction_3f(drcuml_block *block, compiler_state *com
return TRUE;
case 0x12: /* FDIVx */
+ UML_FDCMP(block, F64(G_RB(op)), mem(&m_core->fp0)); // fdcmp rb,0
+ UML_JMPc(block, COND_Z, compiler->labelnum); // bz 1:
UML_FDDIV(block, F64(G_RD(op)), F64(G_RA(op)), F64(G_RB(op))); // fddiv rd,ra,rb
+ UML_JMP(block, compiler->labelnum+1); // bz 2:
+ UML_LABEL(block, compiler->labelnum++); // 1:
+ UML_FDMOV(block, F64(G_RD(op)), mem(&m_core->fp0)); // fdmov rd,0
+ UML_LABEL(block, compiler->labelnum++); // 2:
generate_fp_flags(block, desc, TRUE);
return TRUE;