- MIParser: If the successor list is not specified successors will be
added based on basic block operands in the block and possible
fallthrough.
- MIRPrinter: Adds a new `simplify-mir` option, with that option set:
Skip printing of block successor lists in cases where the
parser is guaranteed to reconstruct it. This means we still print the
list if some successor cannot be determined (happens for example for
jump tables), if the successor order changes or branch probabilities
being unequal.
Differential Revision: https://reviews.llvm.org/D31262
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@302289 91177308-0d34-0410-b5e6-96231b3b80d8
This patch extends the current functionality of the AArch64 redundant copy
elimination pass to handle non-zero cases such as:
BB#0:
cmp x0, #1
b.eq .LBB0_1
.LBB0_1:
orr x0, xzr, #0x1 ; <-- redundant copy; x0 known to hold #1.
Differential Revision: https://reviews.llvm.org/D29344
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296809 91177308-0d34-0410-b5e6-96231b3b80d8
Summary:
Extend AArch64RedundantCopyElimination to catch cases where the register
that is known to be zero is COPY'd in the predecessor block. Before
this change, this pass would catch cases like:
CBZW %W0, <BB#1>
BB#1:
%W0 = COPY %WZR // removed
After this change, cases like the one below are also caught:
%W0 = COPY %W1
CBZW %W1, <BB#1>
BB#1:
%W0 = COPY %WZR // removed
This change results in a 4% increase in static copies removed by this
pass when compiling the llvm test-suite. It also fixes regressions
caused by doing post-RA copy propagation (a separate change to be put up
for review shortly).
Reviewers: junbuml, mcrosier, t.p.northover, qcolombet, MatzeB
Subscribers: aemerson, rengolin, llvm-commits
Differential Revision: https://reviews.llvm.org/D30113
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@295863 91177308-0d34-0410-b5e6-96231b3b80d8
Matthias Braun