fa7367428a
The first variant contains all current transformations except transforming switches into lookup tables. The second variant contains all current transformations. The switch-to-lookup-table conversion results in code that is more difficult to analyze and optimize by other passes. Most importantly, it can inhibit Dead Code Elimination. As such it is often beneficial to only apply this transformation very late. A common example is inlining, which can often result in range restrictions for the switch expression. Changes in execution time according to LNT: SingleSource/Benchmarks/Misc/fp-convert +3.03% MultiSource/Benchmarks/ASC_Sequoia/CrystalMk/CrystalMk -11.20% MultiSource/Benchmarks/Olden/perimeter/perimeter -10.43% and a couple of smaller changes. For perimeter it also results 2.6% a smaller binary. Differential Revision: https://reviews.llvm.org/D30333 llvm-svn: 298799
42 lines
1.4 KiB
LLVM
42 lines
1.4 KiB
LLVM
; RUN: opt -S -latesimplifycfg < %s -mtriple=x86_64-apple-darwin12.0.0 | FileCheck %s
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; rdar://17735071
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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 tableindex can't fit into i2, we should extend the type to i3.
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; CHECK-LABEL: @_TFO6reduce1E5toRawfS0_FT_Si
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; CHECK: entry:
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; CHECK-NEXT: sub i2 %0, -2
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; CHECK-NEXT: zext i2 %switch.tableidx to i3
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; CHECK-NEXT: getelementptr inbounds [4 x i64], [4 x i64]* @switch.table, i32 0, i3 %switch.tableidx.zext
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; CHECK-NEXT: load i64, i64* %switch.gep
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; CHECK-NEXT: ret i64 %switch.load
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define i64 @_TFO6reduce1E5toRawfS0_FT_Si(i2) {
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entry:
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switch i2 %0, label %1 [
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i2 0, label %2
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i2 1, label %3
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i2 -2, label %4
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i2 -1, label %5
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]
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; <label>:1 ; preds = %entry
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unreachable
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; <label>:2 ; preds = %2
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br label %6
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; <label>:3 ; preds = %4
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br label %6
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; <label>:4 ; preds = %6
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br label %6
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; <label>:5 ; preds = %8
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br label %6
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; <label>:6 ; preds = %3, %5, %7, %9
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%7 = phi i64 [ 3, %5 ], [ 2, %4 ], [ 1, %3 ], [ 0, %2 ]
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ret i64 %7
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}
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