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ab3266d1be
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
49 lines
1.5 KiB
LLVM
49 lines
1.5 KiB
LLVM
; RUN: opt -simplifycfg -switch-to-lookup -S %s | FileCheck %s
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; rdar://15268442
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target datalayout = "e-p:64:64:64-S128-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f16:16:16-f32:32:32-f64:64:64-f128:128:128-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
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target triple = "x86_64-apple-darwin12.0.0"
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; CHECK-LABEL: define i3 @coveredswitch_test(
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; CHECK: entry:
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; CHECK-NEXT: sub i3 %input, -4
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; CHECK-NEXT: zext i3 %switch.tableidx to i24
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; CHECK-NEXT: mul i24 %switch.cast, 3
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; CHECK-NEXT: lshr i24 7507338, %switch.shiftamt
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; CHECK-NEXT: trunc i24 %switch.downshift to i3
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; CHECK-NEXT: ret i3 %switch.masked
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define i3 @coveredswitch_test(i3 %input) {
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entry:
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switch i3 %input, label %bb8 [
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i3 0, label %bb7
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i3 1, label %bb
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i3 2, label %bb3
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i3 3, label %bb4
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i3 4, label %bb5
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i3 5, label %bb6
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]
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bb: ; preds = %entry
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br label %bb8
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bb3: ; preds = %entry
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br label %bb8
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bb4: ; preds = %entry
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br label %bb8
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bb5: ; preds = %entry
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br label %bb8
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bb6: ; preds = %entry
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br label %bb8
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bb7: ; preds = %entry
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br label %bb8
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bb8: ; preds = %bb7, %bb6, %bb5, %bb4, %bb3, %bb, %entry
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%result = phi i3 [ 0, %bb7 ], [ 1, %bb6 ], [ 2, %bb5 ], [ 3, %bb4 ], [ 4, %bb3 ], [ 5, %bb ], [ 6, %entry ]
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ret i3 %result
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}
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