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c0e6b8ac3a
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
llvm-svn: 356789
30 lines
795 B
C++
30 lines
795 B
C++
// RUN: %clang_cc1 -emit-llvm -triple=armv7-apple-darwin -std=c++11 %s -o - -O1 \
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// RUN: | FileCheck %s
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// RUN: %clang_cc1 -emit-llvm -triple=armv7-apple-darwin -std=c++11 %s -o - -O1 \
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// RUN: -discard-value-names | FileCheck %s --check-prefix=DISCARDVALUE
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extern "C" void branch();
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bool test(bool pred) {
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// DISCARDVALUE: br i1 %0, label %2, label %3
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// CHECK: br i1 %pred, label %if.then, label %if.end
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if (pred) {
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// DISCARDVALUE: 2:
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// DISCARDVALUE-NEXT: tail call void @branch()
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// DISCARDVALUE-NEXT: br label %3
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// CHECK: if.then:
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// CHECK-NEXT: tail call void @branch()
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// CHECK-NEXT: br label %if.end
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branch();
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}
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// DISCARDVALUE: 3:
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// DISCARDVALUE-NEXT: ret i1 %0
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// CHECK: if.end:
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// CHECK-NEXT: ret i1 %pred
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return pred;
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}
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