forked from OSchip/llvm-project
f59205aef9
The existing way of creating the predicate in the guard blocks uses a boolean value per outgoing block. This increases the number of live booleans as the number of outgoing blocks increases. The new way added in this change is to store one integer to represent the outgoing block we want to branch to, then at each guard block, an integer equality check is performed to decide which a specific outgoing block is taken. Using an integer reduces the number of live values and decreases register pressure especially in cases where there are a large number of outgoing blocks. The integer based approach is used when the number of outgoing blocks crosses a threshold, which is currently set to 32. Patch by Ruiling Song. Differential review: https://reviews.llvm.org/D127831 |
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| .. | ||
| basic.ll | ||
| bug45623.ll | ||
| nested.ll | ||
| switch.ll | ||
| unreachable.ll | ||