This assumption is no longer true since the post-RA optimizer
can work across blocks. It is now possible that some control
flow paths overwrite some but not all registers of an operand.
This commit may prevent invalid optimizations and/or assertion
failures (on debug builds).
Fossil DB stats unaffected on Navi 21.
Fixes:
0e4747d3fb7ec15f8c1d6b971b1352249e7d95c6
Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18488>
if (op.isConstant() || op.isUndefined())
return const_or_undef;
- assert(op.physReg().reg() < max_reg_cnt);
- Idx instr_idx = ctx.instr_idx_by_regs[ctx.current_block->index][op.physReg().reg()];
-
-#ifndef NDEBUG
- /* Debug mode: */
- instr_idx = last_writer_idx(ctx, op.physReg(), op.regClass());
- assert(instr_idx != written_by_multiple_instrs);
-#endif
-
- return instr_idx;
+ return last_writer_idx(ctx, op.physReg(), op.regClass());
}
bool