I am getting this error message:
LLVM ERROR: Cannot select: 0xb1e670: i8 = setcc 0xa94230, 0xf72f00, 0xae22a0 [ID=25]
0xa94230: i32 = AMDILISD::ADD 0xf72f00, 0xf6f7d0 [ID=22]
0xf72f00: i32 = mul 0xb30210, 0xf99250 [ORD=831] [ID=19]
0xb30210: i32,ch = CopyFromReg 0xbbea30, 0xb71800 [ORD=830] [ID=14]
0xb71800: i32 = Register %vreg41 [ORD=830] [ID=1]
0xf99250: i32 = Constant<-83941> [ORD=831] [ID=3]
0xf6f7d0: i32,ch = CopyFromReg 0xbbea30, 0xae37b0 [ORD=830] [ID=15]
0xae37b0: i32 = Register %vreg42 [ORD=830] [ID=2]
0xf72f00: i32 = mul 0xb30210, 0xf99250 [ORD=831] [ID=19]
0xb30210: i32,ch = CopyFromReg 0xbbea30, 0xb71800 [ORD=830] [ID=14]
0xb71800: i32 = Register %vreg41 [ORD=830] [ID=1]
0xf99250: i32 = Constant<-83941> [ORD=831] [ID=3]
This is the code that is triggering the error:
typedef struct{ uint x; uint c; } mwc64x_state_t;
enum{ MWC64X_A = 4294883355U };
enum{ MWC64X_M = 18446383549859758079UL };
void MWC64X_Step(mwc64x_state_t *s)
{
uint X=s->x, C=s->c;
uint Xn=MWC64X_A*X+C;
uint carry=(uint)(Xn<C);
// Replacing this line with a constant makes the error go away.
uint Cn=mad_hi(MWC64X_A,X,carry);
s->x=Xn;
// As does replacing this assignment with a constant.
s->c=Cn;
}
