https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87597
Tobias Burnus <burnus at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |burnus at gcc dot gnu.org
--- Comment #3 from Tobias Burnus <burnus at gcc dot gnu.org> ---
If I look at the dump, i.e.
-fdump-tree-original for -O0 -ffrontend-optimize
I get the following for
B = matmul(A,gamma5)
Re-written in Fortran:
do var1 = 0, 3
do var2 = 0, 3
do var3 = 0, 3
b(var1,var3) = b(var1,var3) + a(var2,var3) * gamma5(var1+1,var2+1)
end do
end do
end do
The "+1" for gamma5 looks wrong!
From the original dump:
b[NON_LVALUE_EXPR <__var_1_do> * 4 + NON_LVALUE_EXPR <__var_3_do>] =
b[NON_LVALUE_EXPR <__var_1_do> * 4 + NON_LVALUE_EXPR <__var_3_do>] +
a[NON_LVALUE_EXPR <__var_2_do> * 4 + NON_LVALUE_EXPR <__var_3_do>] *
gamma5[(__var_1_do + 1) * 4 + (__var_2_do + 1)];
