tree 3c26c23c370fef20415420143de31cfbcd3e0205
parent f8edcba62db3d1174f81d6f8e6acab19c4dbf583
author Tom Tromey <tromey@adacore.com> 1761042474 -0600
committer GitHub <noreply@github.com> 1761042474 +0100
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Minor optimizations to DW_OP_LLVM_extract_bits_* (#163812)

I noticed a couple more small optimization opportunities when generating
DWARF expressions from the internal
DW_OP_LLVM_extract_bits_* operations:

* DW_OP_deref can be used, rather than DW_OP_deref_size, when the deref
size is the word size.

* If the bit offset is 0 and an unsigned extraction is desired, then
sometimes the shifting can be skipped entirely, or replaced with
DW_OP_and.