The previous code was incorrect (can't getReg a frameindex). We could instead optimize it to reduce tree height, but I'm not sure that's worthwhile yet because we then try to eliminate the frameindex.
This patch also fixes frame index elimination for operations which may load or store: it used to assume the base was operand 2 and immediate offset operand 1. That's not true for stores, where they're 4 and 3.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@259305 91177308-0d34-0410-b5e6-96231b3b80d8
r258781 optimized memcpy/memmove/memcpy so the intrinsic call can return its first argument, but missed the frame index case. Teach it to ignore that case so C code doesn't assert out in these cases.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@258851 91177308-0d34-0410-b5e6-96231b3b80d8
These calls return their first argument, but because LLVM uses an intrinsic
with a void return type, they can't use the returned attribute. Generalize
the store results pass to optimize these calls too.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@258781 91177308-0d34-0410-b5e6-96231b3b80d8
The WebAssemblyStoreResults pass runs before LiveVariables, so it doesn't
expect to have to keep dead flags up to date; check this with an assert.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@255551 91177308-0d34-0410-b5e6-96231b3b80d8
When a block has no terminator instructions, getFirstTerminator() returns
end(), which can't be used in dominance checks. Check dominance for phi
operands separately.
Also, remove some bits from WebAssemblyRegStackify.cpp that were causing
trouble on the same testcase; they were left behind from an earlier
experiment.
Differential Revision: http://reviews.llvm.org/D15210
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@254662 91177308-0d34-0410-b5e6-96231b3b80d8
