https://llvm.org/bugs/show_bug.cgi?id=24220
Bug ID: 24220
Summary: Duplicate case blocks in switch can be merged
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Scalar Optimizations
Assignee: unassignedb...@nondot.org
Reporter: listm...@philipreames.com
CC: llvmbugs@cs.uiuc.edu
Classification: Unclassified
In the following example, many of the case blocks of the switch are identical
and could be merged into a single basic block. This transformation should
likely live inside SimplifyCFG.
declare void @foo()
declare void @bar()
define void @test(i16 %val1, i32 %local_2_) {
bci_84: ; preds = %normal_return12
switch i16 %val1, label %bci_149 [
i16 45, label %bci_90
i16 43, label %bci_103
i16 58, label %bci_116
i16 95, label %bci_129
i16 46, label %bci_142
]
bci_149:
call void @foo()
ret void
bci_158:
call void @bar()
ret void
bci_142: ; preds = %bci_84
%.old = icmp eq i32 %local_2_, 0
br i1 %.old, label %bci_149, label %bci_158
bci_129: ; preds = %bci_84
%_20 = icmp eq i32 %local_2_, 0
br i1 %_20, label %bci_149, label %bci_158
bci_116: ; preds = %bci_84
%_21 = icmp eq i32 %local_2_, 0
br i1 %_21, label %bci_149, label %bci_158
bci_103: ; preds = %bci_84
%_22 = icmp eq i32 %local_2_, 0
br i1 %_22, label %bci_149, label %bci_158
bci_90: ; preds = %bci_84
%_23 = icmp eq i32 %local_2_, 0
br i1 %_23, label %bci_149, label %bci_158
}
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