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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
41 lines
796 B
LLVM
41 lines
796 B
LLVM
; RUN: opt < %s -lowerswitch -S | FileCheck %s
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define i32 @test(i32 %arg) #0 {
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; CHECK-LABEL: @test
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; CHECK: 2:
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; CHECK-NEXT: %res.0 = phi i32 [ 1, %NodeBlock ], [ 2, %1 ]
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; CHECK-NEXT: br label %3
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; CHECK: 5:
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; CHECK-NEXT: %res.3 = phi i32 [ 0, %NewDefault ], [ %res.2, %4 ]
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; CHECK-NEXT: %6 = add nsw i32 %res.3, 1
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; CHECK-NEXT: ret i32 %6
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switch i32 %arg, label %5 [
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i32 1, label %1
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i32 2, label %2
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i32 3, label %3
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i32 4, label %4
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]
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1:
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br label %2
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2:
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%res.0 = phi i32 [ 1, %0 ], [ 2, %1 ]
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br label %3
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3:
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%res.1 = phi i32 [ 0, %0 ], [ %res.0, %2 ]
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%phitmp = add nsw i32 %res.1, 2
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br label %4
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4:
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%res.2 = phi i32 [ 1, %0 ], [ %phitmp, %3 ]
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br label %5
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5:
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%res.3 = phi i32 [ 0, %0 ], [ %res.2, %4 ]
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%6 = add nsw i32 %res.3, 1
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ret i32 %6
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}
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