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
51 lines
1.4 KiB
LLVM
51 lines
1.4 KiB
LLVM
; RUN: opt -S -simplifycfg -switch-to-lookup < %s -mtriple=x86_64-apple-darwin12.0.0 | FileCheck %s
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; rdar://17887153
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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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; When we have a covered lookup table, make sure we don't delete PHINodes that
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; are cached in PHIs.
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; CHECK-LABEL: @test
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; CHECK: entry:
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; CHECK-NEXT: sub i3 %arg, -4
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; CHECK-NEXT: zext i3 %switch.tableidx to i4
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; CHECK-NEXT: getelementptr inbounds [8 x i64], [8 x i64]* @switch.table.test, i32 0, i4 %switch.tableidx.zext
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; CHECK-NEXT: load i64, i64* %switch.gep
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; CHECK-NEXT: add i64
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; CHECK-NEXT: ret i64
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define i64 @test(i3 %arg) {
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entry:
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switch i3 %arg, label %Default [
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i3 -2, label %Label6
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i3 1, label %Label1
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i3 2, label %Label2
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i3 3, label %Label3
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i3 -4, label %Label4
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i3 -3, label %Label5
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]
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Default:
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%v1 = phi i64 [ 7, %Label6 ], [ 11, %Label5 ], [ 6, %Label4 ], [ 13, %Label3 ], [ 9, %Label2 ], [ 15, %Label1 ], [ 8, %entry ]
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%v2 = phi i64 [ 0, %Label6 ], [ 0, %Label5 ], [ 0, %Label4 ], [ 0, %Label3 ], [ 0, %Label2 ], [ 0, %Label1 ], [ 0, %entry ]
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%v3 = add i64 %v1, %v2
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ret i64 %v3
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Label1:
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br label %Default
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Label2:
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br label %Default
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Label3:
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br label %Default
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Label4:
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br label %Default
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Label5:
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br label %Default
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Label6:
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br label %Default
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}
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