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This patch fixes a bug in the current vsetvl pass. The current pass uses `m_vl` to determine whether the dest operand has been used by non-RVV instructions. However, `m_vl` may have been modified as a result of an `update_avl` call, and thus would be no longer the dest operand of the original instruction. This can lead to incorrect vsetvl eliminations, as is shown in the testcase. In this patch, we create a `dest_vl` variable for this scenerio. gcc/ChangeLog: * config/riscv/riscv-vsetvl.cc: Use `dest_vl` for dest VL operand gcc/testsuite/ChangeLog: * gcc.target/riscv/rvv/vsetvl/vsetvl_bug-3.c: New test. |
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