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The following allows vectorizing the gcc.target/i386/pr111023*.c testcases again with -m32 -msse2 by ensuring we see through a cast when looking for vector extract sources during costing of vector construction. This, together with the forwprop fix fixes the regression on those testcases. PR target/120234 * config/i386/i386.cc (ix86_vector_costs::add_stmt_cost): For constructor elements always look through a conversion. Rewrite load and vector extraction matching to be more obvious. Allow arbitrary conversions from the vector extract to elide costing of a gpr<->xmm move.
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