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2014 Oct 24
3
[LLVMdev] IndVar widening in IndVarSimplify causing performance regression on GPU programs
...i = 0; i < n; i += 3) {
output[i] = i * i;
}
}
Without widening, the loop body in the PTX (a low-level assembly-like
language generated by NVPTX64) is:
BB0_2: // =>This Inner Loop Header:
Depth=1
mul.lo.s32 %r5, %r6, %r6;
st.u32 [%rd4], %r5;
add.s32 %r6, %r6, 3;
add.s64 %rd4, %rd4, 12;
setp.lt.s32 %p2, %r6, %r3;
@%p2 bra BB0_2;
in which %r6 is the induction variable i.
With widening, the loop body becomes:
BB0_2: // =>This Inner Lo...
2010 Apr 07
0
question about fold function
...1 46236 1 42 0.8769 0 NA NA NA NA NA NA
2 93340 1 42 0.1926 0 NA NA NA NA NA NA
3 93340 1 43 0.0000 0 NA NA NA NA NA NA
NEWPROD8 RD1 RD2 RD3 RD4 RD5 RD6 RD7 RD8
1 NA 0 NA NA NA NA NA NA NA
2 NA 0 NA NA NA NA NA NA NA
3 NA 0 NA NA NA NA NA NA NA
> d4<-fold(d6,time='survival',event='dead',cov=c(16:23,24:31),cov.names=c('newproduct','R&D'))
Error in dimna...