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@kavon says that this will improve block layout for stack checks.
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This reverts commit adcb5fb47c0942671d409b940d8884daa9359ca4.
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- Fix for #13904 -- stop "trashing" callee-saved registers, since it is
not actually doing anything useful.
- Fix for #14251 -- fixes the calling convention for functions passing
raw SSE-register values by adding padding as needed to get the values
in the right registers. This problem cropped up when some args were
unused an dropped from the live list.
- Fixed a typo in 'readnone' attribute
- Added 'lower-expect' pass to level 0 LLVM optimization passes to
improve block layout in LLVM for stack checks, etc.
Test Plan: `make test WAYS=optllvm` and `make test WAYS=llvm`
Reviewers: bgamari, simonmar, angerman
Reviewed By: angerman
Subscribers: rwbarton, carter
GHC Trac Issues: #13904, #14251
Differential Revision: https://phabricator.haskell.org/D5190
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To resolve ticket #11295, I think it makes sense to stop hard-coding
the pass sequences used by GHC when compiling with LLVM into the
compiler
itself.
This patchset introduces a companion to the existing `llvm-targets` file
called `llvm-passes`. The passes file is a simple association list that
holds the default LLVM `opt` pass sequence used by GHC. This allows end
users to easily save their favorite optimization flags when compiling
with LLVM.
The main benefit for ticket #11295 is that when adding a custom pass
sequence, it tends to be an extremely long string that would be
unsightly in the code.
This is essentially part 1 of 2 for ticket #11295.
Test Plan: ./validate
Reviewers: bgamari, angerman
Reviewed By: angerman
Subscribers: rwbarton, thomie, carter
Differential Revision: https://phabricator.haskell.org/D4695
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