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fix mullwo & divw on invalid inputs

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This commit is contained in:
gbeauche 2003-11-09 07:19:39 +00:00
parent aebcb7a6bb
commit 59e6227c08
1 changed files with 5 additions and 7 deletions
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12
SheepShaver/src/kpx_cpu/src/cpu/ppc/ppc-execute.cpp
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@ -33,7 +33,7 @@
#include "mon_disass.h"
#endif
#define DEBUG 1
#define DEBUG 0
#include "debug.h"
/**
@ -390,13 +390,11 @@ void powerpc_cpu::execute_divide(uint32 opcode)
if (b == 0 || (SB && a == 0x80000000 && b == 0xffffffff)) {
// Reference manual says rD is undefined
d = 0;
#if 1
if (SB && b == 0) {
if (SB) {
// However, checking against a real PowerPC (7410) yields
// that rD gets all bits set to rA MSB
d -= (a >> 31);
d = -(a >> 31);
}
#endif
if (OE::test(opcode))
xer().set_ov(1);
}
@ -434,8 +432,8 @@ void powerpc_cpu::execute_multiply(uint32 opcode)
// Overflow if the product cannot be represented in 32 bits
if (OE::test(opcode)) {
const uint32 upper = d >> 32;
xer().set_ov(upper != 0 && upper != 0xffffffff);
xer().set_ov((d & UVAL64(0xffffffff80000000)) != 0 &&
(d & UVAL64(0xffffffff80000000)) != UVAL64(0xffffffff80000000));
}
// Only keep high word if multiply high instruction