forked from OSchip/llvm-project
87 lines
2.5 KiB
LLVM
87 lines
2.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -simplifycfg -S | FileCheck %s
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; PR10131
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32-n8:16:32"
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target triple = "i386-pc-linux-gnu"
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define i32 @t(i32 %m) nounwind readnone {
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; CHECK-LABEL: @t(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[SWITCH:%.*]] = icmp ult i32 [[M:%.*]], 4
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; CHECK-NEXT: [[M_:%.*]] = select i1 [[SWITCH]], i32 [[M]], i32 4
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; CHECK-NEXT: ret i32 [[M_]]
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;
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entry:
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switch i32 %m, label %sw.bb4 [
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i32 0, label %sw.bb0
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i32 1, label %sw.bb1
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i32 2, label %sw.bb2
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i32 3, label %sw.bb3
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]
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sw.bb0: ; preds = %entry
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br label %return
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sw.bb1: ; preds = %entry
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br label %return
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sw.bb2: ; preds = %entry
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br label %return
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sw.bb3: ; preds = %entry
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br label %return
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sw.bb4: ; preds = %entry
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br label %return
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return: ; preds = %entry, %sw.bb4, %sw.bb3, %sw.bb2, %sw.bb1
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%retval.0 = phi i32 [ 4, %sw.bb4 ], [ 3, %sw.bb3 ], [ 2, %sw.bb2 ], [ 1, %sw.bb1 ], [ 0, %sw.bb0 ]
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ret i32 %retval.0
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}
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; If 1 incoming phi value is a case constant of a switch, convert it to the switch condition:
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; https://bugs.llvm.org/show_bug.cgi?id=34471
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; This then subsequently should allow squashing of the other trivial case blocks.
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define i32 @PR34471(i32 %x) {
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; CHECK-LABEL: @PR34471(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: switch i32 [[X:%.*]], label [[ELSE3:%.*]] [
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; CHECK-NEXT: i32 17, label [[RETURN:%.*]]
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; CHECK-NEXT: i32 19, label [[IF19:%.*]]
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; CHECK-NEXT: i32 42, label [[IF42:%.*]]
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; CHECK-NEXT: ]
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; CHECK: if19:
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; CHECK-NEXT: br label [[RETURN]]
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; CHECK: if42:
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; CHECK-NEXT: br label [[RETURN]]
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; CHECK: else3:
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; CHECK-NEXT: br label [[RETURN]]
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; CHECK: return:
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; CHECK-NEXT: [[R:%.*]] = phi i32 [ [[X]], [[IF19]] ], [ [[X]], [[IF42]] ], [ 0, [[ELSE3]] ], [ 17, [[ENTRY:%.*]] ]
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; CHECK-NEXT: ret i32 [[R]]
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;
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entry:
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switch i32 %x, label %else3 [
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i32 17, label %return
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i32 19, label %if19
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i32 42, label %if42
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]
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if19:
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br label %return
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if42:
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br label %return
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else3:
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br label %return
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return:
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%r = phi i32 [ %x, %if19 ], [ %x, %if42 ], [ 0, %else3 ], [ 17, %entry ]
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ret i32 %r
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}
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