// ------------------------------------------------------------------------
// Writes a jump at the current x86Ptr, which targets a pre-established target address.
// (usually a backwards jump)
//
// slideForward - used internally by xSmartJump to indicate that the jump target is going
// to slide forward in the event of an 8 bit displacement.
//
__emitinline void xJccKnownTarget(JccComparisonType comparison, const void *target, bool slideForward)
{
// Calculate the potential j8 displacement first, assuming an instruction length of 2:
sptr displacement8 = (sptr)target - (sptr)(xGetPtr() + 2);
const int slideVal = slideForward ? ((comparison == Jcc_Unconditional) ? 3 : 4) : 0;
displacement8 -= slideVal;
if (slideForward) {
pxAssertDev(displacement8 >= 0, "Used slideForward on a backward jump; nothing to slide!");
}
if (is_s8(displacement8))
xJcc8(comparison, displacement8);
else {
// Perform a 32 bit jump instead. :(
s32 *bah = xJcc32(comparison);
sptr distance = (sptr)target - (sptr)xGetPtr();
#ifdef __x86_64__
// This assert won't physically happen on x86 targets
pxAssertDev(distance >= -0x80000000LL && distance < 0x80000000LL, "Jump target is too far away, needs an indirect register");
#endif
*bah = (s32)distance;
}
}
// ------------------------------------------------------------------------
// Writes a jump at the current x86Ptr, which targets a pre-established target address.
// (usually a backwards jump)
//
// slideForward - used internally by xSmartJump to indicate that the jump target is going
// to slide forward in the event of an 8 bit displacement.
//
__emitinline void xJccKnownTarget( JccComparisonType comparison, const void* target, bool slideForward )
{
// Calculate the potential j8 displacement first, assuming an instruction length of 2:
sptr displacement8 = (sptr)target - (sptr)(xGetPtr() + 2);
const int slideVal = slideForward ? ((comparison == Jcc_Unconditional) ? 3 : 4) : 0;
displacement8 -= slideVal;
if( slideForward )
{
pxAssertDev( displacement8 >= 0, "Used slideForward on a backward jump; nothing to slide!" );
}
if( is_s8( displacement8 ) )
xJcc8( comparison, displacement8 );
else
{
// Perform a 32 bit jump instead. :(
s32* bah = xJcc32( comparison );
*bah = (s32)target - (s32)xGetPtr();
}
}
