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6df50f4718
Just as as llvm IR supports explicitly specifying numeric value ids
for instructions, and emits them by default in textual output, now do
the same for blocks.
This is a slightly incompatible change in the textual IR format.
Previously, llvm would parse numeric labels as string names. E.g.
define void @f() {
br label %"55"
55:
ret void
}
defined a label *named* "55", even without needing to be quoted, while
the reference required quoting. Now, if you intend a block label which
looks like a value number to be a name, you must quote it in the
definition too (e.g. `"55":`).
Previously, llvm would print nameless blocks only as a comment, and
would omit it if there was no predecessor. This could cause confusion
for readers of the IR, just as unnamed instructions did prior to the
addition of "%5 = " syntax, back in 2008 (PR2480).
Now, it will always print a label for an unnamed block, with the
exception of the entry block. (IMO it may be better to print it for
the entry-block as well. However, that requires updating many more
tests.)
Thus, the following is supported, and is the canonical printing:
define i32 @f(i32, i32) {
%3 = add i32 %0, %1
br label %4
4:
ret i32 %3
}
New test cases covering this behavior are added, and other tests
updated as required.
Differential Revision: https://reviews.llvm.org/D58548
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@356789 91177308-0d34-0410-b5e6-96231b3b80d8
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| .. | ||
| 20100809_bb_not_in_domtree.ll | ||
| bad_node_traversal.ll | ||
| block_sort.ll | ||
| cond_loop.ll | ||
| condition_complicated_2.ll | ||
| condition_complicated.ll | ||
| condition_forward_edge.ll | ||
| condition_same_exit.ll | ||
| condition_simple.ll | ||
| exit_in_condition.ll | ||
| infinite_loop_2.ll | ||
| infinite_loop_3.ll | ||
| infinite_loop_4.ll | ||
| infinite_loop_5_a.ll | ||
| infinite_loop_5_b.ll | ||
| infinite_loop_5_c.ll | ||
| infinite_loop.ll | ||
| loop_with_condition.ll | ||
| loops_1.ll | ||
| loops_2.ll | ||
| mix_1.ll | ||
| multiple_exiting_edge.ll | ||
| nested_loops.ll | ||
| next.ll | ||
| outgoing_edge_1.ll | ||
| outgoing_edge.ll | ||
| paper.ll | ||
| two_loops_same_header.ll | ||
| unreachable_bb.ll | ||