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Diffstat (limited to 'gcc/testsuite/gfortran.dg/vect/fast-math-mgrid-resid.f')
| -rw-r--r-- | gcc/testsuite/gfortran.dg/vect/fast-math-mgrid-resid.f | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/gcc/testsuite/gfortran.dg/vect/fast-math-mgrid-resid.f b/gcc/testsuite/gfortran.dg/vect/fast-math-mgrid-resid.f new file mode 100644 index 000000000..8f196a69a --- /dev/null +++ b/gcc/testsuite/gfortran.dg/vect/fast-math-mgrid-resid.f @@ -0,0 +1,46 @@ +! { dg-do compile { target i?86-*-* x86_64-*-* } } +! { dg-require-effective-target vect_double } +! { dg-require-effective-target sse2 } +! { dg-options "-O3 -ffast-math -msse2 -fpredictive-commoning -ftree-vectorize -fdump-tree-optimized" } + + +******* RESID COMPUTES THE RESIDUAL: R = V - AU +* +* THIS SIMPLE IMPLEMENTATION COSTS 27A + 4M PER RESULT, WHERE +* A AND M DENOTE THE COSTS OF ADDITION (OR SUBTRACTION) AND +* MULTIPLICATION, RESPECTIVELY. BY USING SEVERAL TWO-DIMENSIONAL +* BUFFERS ONE CAN REDUCE THIS COST TO 13A + 4M IN THE GENERAL +* CASE, OR 10A + 3M WHEN THE COEFFICIENT A(1) IS ZERO. +* + SUBROUTINE RESID(U,V,R,N,A) + INTEGER N + REAL*8 U(N,N,N),V(N,N,N),R(N,N,N),A(0:3) + INTEGER I3, I2, I1 +C + DO 600 I3=2,N-1 + DO 600 I2=2,N-1 + DO 600 I1=2,N-1 + 600 R(I1,I2,I3)=V(I1,I2,I3) + > -A(0)*( U(I1, I2, I3 ) ) + > -A(1)*( U(I1-1,I2, I3 ) + U(I1+1,I2, I3 ) + > + U(I1, I2-1,I3 ) + U(I1, I2+1,I3 ) + > + U(I1, I2, I3-1) + U(I1, I2, I3+1) ) + > -A(2)*( U(I1-1,I2-1,I3 ) + U(I1+1,I2-1,I3 ) + > + U(I1-1,I2+1,I3 ) + U(I1+1,I2+1,I3 ) + > + U(I1, I2-1,I3-1) + U(I1, I2+1,I3-1) + > + U(I1, I2-1,I3+1) + U(I1, I2+1,I3+1) + > + U(I1-1,I2, I3-1) + U(I1-1,I2, I3+1) + > + U(I1+1,I2, I3-1) + U(I1+1,I2, I3+1) ) + > -A(3)*( U(I1-1,I2-1,I3-1) + U(I1+1,I2-1,I3-1) + > + U(I1-1,I2+1,I3-1) + U(I1+1,I2+1,I3-1) + > + U(I1-1,I2-1,I3+1) + U(I1+1,I2-1,I3+1) + > + U(I1-1,I2+1,I3+1) + U(I1+1,I2+1,I3+1) ) +C + RETURN + END +! we want to check that predictive commoning did something on the +! vectorized loop, which means we have to have exactly 13 vector +! additions. +! { dg-final { scan-tree-dump-times "vect_var\[^\\n\]*\\+ " 13 "optimized" } } +! { dg-final { cleanup-tree-dump "vect" } } +! { dg-final { cleanup-tree-dump "optimized" } } |