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Philip Reames 6865b977ae [RewriteStatepointsForGC] Extend base pointer to handle more cases w/vectors
When relocating a pointer, we need to determine a base pointer for the derived pointer being relocated. We have limited support for handling a pointer extracted from a vector; the current code only handled the case where the entire vector was known to contain base pointers. This patch extends the reasoning to handle chains of insertelements where the indices are constants. This case turns out to be fairly common in vectorized code. We can now handle vectors which contains mixtures of base and derived pointers provided the insertelements use constant indices.

Note that this doesn't solve the general problem. To handle variable indexed insertelements, we'd need to scalarize and introduce conditional branching based on the index. Alternatively, we could eagerly scalarize, but the code structure doesn't currently make either fix easy. The patch also doesn't handle shufflevector or other vector manipulation for much the same reasons. I plan to defer this work until I have a motivating test case.

Differential Revision: http://reviews.llvm.org/D9676



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237200 91177308-0d34-0410-b5e6-96231b3b80d8
2015-05-12 22:19:52 +00:00
autoconf Deprecate in-source autotools builds 2015-05-04 02:04:54 +00:00
bindings IR: Give 'DI' prefix to debug info metadata 2015-04-29 16:38:44 +00:00
cmake [lib/Fuzzer] use -fsanitize-coverage=trace-cmp when building LLVM with LLVM_USE_SANITIZE_COVERAGE; in lib/Fuzzer try to reload the corpus to pick up new units from other processes 2015-05-08 21:30:55 +00:00
docs [Statepoints] Split the calling convention and statepoint flags operand to STATEPOINT into two separate operands. 2015-05-12 19:50:19 +00:00
examples [Orc] Reapply r236465 with fixes for the MSVC bots. 2015-05-05 17:37:18 +00:00
include Tidy comments in SampleProfile header. NFC. 2015-05-12 22:03:00 +00:00
lib [RewriteStatepointsForGC] Extend base pointer to handle more cases w/vectors 2015-05-12 22:19:52 +00:00
projects build: make libunwind a proper project 2015-04-25 01:47:39 +00:00
test [RewriteStatepointsForGC] Extend base pointer to handle more cases w/vectors 2015-05-12 22:19:52 +00:00
tools Migrate existing backends that care about software floating point 2015-05-12 01:26:05 +00:00
unittests Readdress r236990, use of static members on a non-static variable. 2015-05-11 22:20:48 +00:00
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CMakeLists.txt [CMake] Updates to llvm-shlib to support overriding exports list and added an option to export all symbols. 2015-04-13 21:29:46 +00:00
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