char SIAssignInterpRegsPass::ID = 0;
#define INTERP_VALUES 16
+#define REQUIRED_VALUE_MAX_INDEX 7
struct interp_info {
bool enabled;
return false;
}
MachineRegisterInfo &MRI = MF.getRegInfo();
+ bool ForceEnable = true;
/* First pass, mark the interpolation values that are used. */
for (unsigned interp_idx = 0; interp_idx < INTERP_VALUES; interp_idx++) {
for (unsigned reg_idx = 0; reg_idx < InterpUse[interp_idx].reg_count;
reg_idx++) {
- InterpUse[interp_idx].enabled =
+ InterpUse[interp_idx].enabled = InterpUse[interp_idx].enabled ||
!MRI.use_empty(InterpUse[interp_idx].regs[reg_idx]);
+ if (InterpUse[interp_idx].enabled &&
+ interp_idx <= REQUIRED_VALUE_MAX_INDEX) {
+ ForceEnable = false;
+ }
}
}
+ // At least one interpolation mode must be enabled or else the GPU will hang.
+ if (ForceEnable) {
+ InterpUse[0].enabled = true;
+ }
+
unsigned used_vgprs = 0;
/* Second pass, replace with VGPRs. */