b049173157
This is no-functional-change-intended. This is repackaging the functionality of D30333 (defer switch-to-lookup-tables) and D35411 (defer folding unconditional branches) with pass parameters rather than a named "latesimplifycfg" pass. Now that we have individual options to control the functionality, we could decouple when these fire (but that's an independent patch if desired). The next planned step would be to add another option bit to disable the sinking transform mentioned in D38566. This should also make it clear that the new pass manager needs to be updated to limit simplifycfg in the same way as the old pass manager. Differential Revision: https://reviews.llvm.org/D38631 llvm-svn: 316835
46 lines
1.3 KiB
LLVM
46 lines
1.3 KiB
LLVM
; RUN: opt < %s -simplifycfg -switch-to-lookup -S -mtriple=x86_64-unknown-linux-gnu | FileCheck %s
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; In the presence of "-no-jump-tables"="true", simplifycfg should not convert switches to lookup tables.
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; CHECK: @switch.table.bar = private unnamed_addr constant [4 x i32] [i32 55, i32 123, i32 0, i32 -1]
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; CHECK-LABEL: foo
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; CHECK-NOT: @switch.table.foo = private unnamed_addr constant [4 x i32] [i32 55, i32 123, i32 0, i32 -1]
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define i32 @foo(i32 %c) "no-jump-tables"="true" {
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entry:
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switch i32 %c, label %sw.default [
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i32 42, label %return
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i32 43, label %sw.bb1
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i32 44, label %sw.bb2
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i32 45, label %sw.bb3
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]
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sw.bb1: br label %return
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sw.bb2: br label %return
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sw.bb3: br label %return
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sw.default: br label %return
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return:
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%retval.0 = phi i32 [ 15, %sw.default ], [ -1, %sw.bb3 ], [ 0, %sw.bb2 ], [ 123, %sw.bb1 ], [ 55, %entry ]
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ret i32 %retval.0
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}
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define i32 @bar(i32 %c) {
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entry:
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switch i32 %c, label %sw.default [
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i32 42, label %return
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i32 43, label %sw.bb1
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i32 44, label %sw.bb2
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i32 45, label %sw.bb3
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]
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sw.bb1: br label %return
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sw.bb2: br label %return
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sw.bb3: br label %return
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sw.default: br label %return
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return:
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%retval.0 = phi i32 [ 15, %sw.default ], [ -1, %sw.bb3 ], [ 0, %sw.bb2 ], [ 123, %sw.bb1 ], [ 55, %entry ]
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ret i32 %retval.0
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}
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