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The comment above expand_vector_broadcast() states a precondition that the mode of op must be the element mode of vmode. But when expand_binop() called expand_vector_broadcast() to broadcast the shift amount, it only truncated the shift amount if it's too wide, but no action is performed if the shift amount is too narrow. PR middle-end/124250 PR target/123807 gcc/ * optabs.cc (expand_vector_broadcast): Add a checking assert to verify the precondition about the input modes. (expand_binop): Extend the shift amount if it's narrower than the element of the shifted vector. gcc/testsuite/ * gcc.c-torture/compile/pr124250.c: New test.
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