rustc_codegen_llvm: Require opt-level >= 1 for index-based write_operand_repeatedly() loop
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To make debugger stepping intuitive with `-Copt-level=0`. See the adjusted `basic-stepping.rs` test. This is kind of a revert of bd0aae9, except we don't revert it, we just make it conditional on `opt-level`. That commit regressed `basic-stepping.rs`, but it was not noticed since that test did not exist back then. I have retroactively bisected to find that out. It seems messy to sprinkle if-cases inside of the `write_operand_repeatedly()` so make the whole function conditional. The test that bd0aae9 added in `tests/codegen/issues/issue-111603.rs` already use `-Copt-level=3`, so we don't need to adjust the compiler flags for it to keep passing.
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opt-level >= 1 for index-based loopopt-level >= 1 for index-based write_operand_repeatedly() loop
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To make debugger stepping intuitive with
-Copt-level=0. See the adjustedbasic-stepping.rstest.This is kind of a revert of bd0aae9 (cg_llvm: use index-based loop in write_operand_repeatedly), except we don't revert it, we just make it conditional on
opt-level. That commit regressedbasic-stepping.rs, but it was not noticed since that test did not exist back then (it was added later in #144876). I have retroactively bisected to find that out.It seems messy to sprinkle if-cases inside of
write_operand_repeatedly()so make the whole function conditional.The test that bd0aae9 added in
tests/codegen/issues/issue-111603.rsalready use-Copt-level=3, so we don't need to adjust the compiler flags for it to keep passing.This PR takes us one step closer to fixing #33013.
CC #147426 which is related (there will be trivial conflicts for me to resolve in basic-stepping.rs once one of them lands)