89ca0fffa4
This avoids a regression on deferred_character_23.f90 later in the patch series when array references are rewritten to use pointer arithmetic. The problem is a SAVE_EXPR tree as TYPE_SIZE_UNIT of one array element type, which is used by the pointer arithmetic expressions. As these expressions appear in both branches of an if-then-else block, the tree is lowered to a variable in one of the branches but it’s used in both branches, which is invalid middle-end code. This change pre-evaluates the array references or pointer arithmetics to variables before the if-then-else block, so that the SAVE_EXPR are expanded to variables in the parent scope of the if-then-else block, and expressions referencing the variables remain valid in both branches. PR fortran/102043 gcc/fortran/ChangeLog: * trans-expr.cc: Pre-evaluate src and dest to variables before using them. gcc/testsuite/ChangeLog: * gfortran.dg/dependency_49.f90: Update variable occurence count. |
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