We are using TOCEntry symbols like `LC..0` in TOC loads,
this is hard to read , at least requiring an additional step to figure
out the loaded symbols.
We should print out the name in comments.
Reviewed By: #powerpc, shchenz
Differential Revision: https://reviews.llvm.org/D102949
This is for XCOFF DWARF support.
Seems when DWARF debug is enable, symbol 0 has special usage
for AIX binder. At least, symbol 0 can not be the .text
section. Otherwise, we get some binding time error.
Add correct C_FILE symbol at index 0 here to make AIX binder
work.
Reviewed By: hubert.reinterpretcast
Differential Revision: https://reviews.llvm.org/D97117
Summary:
This patch does the following:
1. Make InitTargetOptionsFromCodeGenFlags() accepts Triple as a
parameter, because some options' default value is triple dependant.
2. DataSections is turned on by default on AIX for llc.
3. Test cases change accordingly because of the default behaviour change.
4. Clang Driver passes in -fdata-sections by default on AIX.
Reviewed By: MaskRay, DiggerLin
Differential Revision: https://reviews.llvm.org/D88737
This rewrites big parts of the fast register allocator. The basic
strategy of doing block-local allocation hasn't changed but I tweaked
several details:
Track register state on register units instead of physical
registers. This simplifies and speeds up handling of register aliases.
Process basic blocks in reverse order: Definitions are known to end
register livetimes when walking backwards (contrary when walking
forward then uses may or may not be a kill so we need heuristics).
Check register mask operands (calls) instead of conservatively
assuming everything is clobbered. Enhance heuristics to detect
killing uses: In case of a small number of defs/uses check if they are
all in the same basic block and if so the last one is a killing use.
Enhance heuristic for copy-coalescing through hinting: We check the
first k defs of a register for COPYs rather than relying on there just
being a single definition. When testing this on the full llvm
test-suite including SPEC externals I measured:
average 5.1% reduction in code size for X86, 4.9% reduction in code on
aarch64. (ranging between 0% and 20% depending on the test) 0.5%
faster compiletime (some analysis suggests the pass is slightly slower
than before, but we more than make up for it because later passes are
faster with the reduced instruction count)
Also adds a few testcases that were broken without this patch, in
particular bug 47278.
Patch mostly by Matthias Braun
Summary:
When running a large test in LLVM_ENABLE_EXPENSIVE_CHECKS=ON mode,
buildbot could hit timeout.
Disable the test when this mode is on.
Also disable it for debug so that the test won't hang for too long.
Reviewed By: hubert.reinterpretcast
Differential Revision: https://reviews.llvm.org/D87794
Summary:
In small code model, AIX assembler could not deal with labels that
could not be reached within the [-0x8000, 0x8000) range from TOC base.
So when generating the assembly, we would need to help the assembler
by subtracting an offset from the label to keep the actual value
within [-0x8000, 0x8000).
Reviewed By: hubert.reinterpretcast, Xiangling_L
Differential Revision: https://reviews.llvm.org/D86879
Jinsong Ji