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a421ac689f
This can significantly reduce the size of the switch, allowing for more efficient lowering. I also worked with the idea of exploiting unreachable defaults by omitting the range check for jump tables, but always ended up with a non-neglible binary size increase. It might be worth looking into some more. SimplifyCFG currently does this transformation, but I'm working towards changing that so we can optimize harder based on unreachable defaults. Differential Revision: http://reviews.llvm.org/D6510 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223566 91177308-0d34-0410-b5e6-96231b3b80d8
41 lines
1.3 KiB
LLVM
41 lines
1.3 KiB
LLVM
; RUN: llc -mtriple=x86_64-apple-darwin10 -O0 < %s | FileCheck %s
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; test that we print a label that we use. We had a bug where
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; we would print the jump, but not the label because it was considered
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; a fall through.
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; CHECK: jmp LBB0_9
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; CHECK: LBB0_9: ## %cleanup
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define void @foo() {
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entry:
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br i1 undef, label %land.lhs.true, label %if.end11
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land.lhs.true: ; preds = %entry
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br i1 undef, label %if.then, label %if.end11
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if.then: ; preds = %land.lhs.true
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br i1 undef, label %if.then9, label %if.end
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if.then9: ; preds = %if.then
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br label %cleanup
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if.end: ; preds = %if.then
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br label %cleanup
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cleanup: ; preds = %if.end, %if.then9
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switch i32 undef, label %default [
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i32 0, label %cleanup.cont
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i32 1, label %if.end11
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]
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cleanup.cont: ; preds = %cleanup
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br label %if.end11
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if.end11: ; preds = %cleanup.cont, %cleanup, %land.lhs.true, %entry
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ret void
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default: ; preds = %cleanup
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br label %if.end11
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}
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