120 lines
3.1 KiB
LLVM
120 lines
3.1 KiB
LLVM
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; RUN: opt < %s -correlated-propagation -S | FileCheck %s
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; Removed several cases from switch.
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define i32 @switch1(i32 %s) {
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; CHECK-LABEL: @switch1(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[S:%.*]], 0
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; CHECK-NEXT: br i1 [[CMP]], label [[NEGATIVE:%.*]], label [[OUT:%.*]]
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;
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entry:
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%cmp = icmp slt i32 %s, 0
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br i1 %cmp, label %negative, label %out
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negative:
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; CHECK: negative:
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; CHECK-NEXT: switch i32 [[S]], label [[OUT]] [
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; CHECK-NEXT: i32 -2, label [[NEXT:%.*]]
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; CHECK-NEXT: i32 -1, label [[NEXT]]
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switch i32 %s, label %out [
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i32 0, label %out
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i32 1, label %out
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i32 -1, label %next
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i32 -2, label %next
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i32 2, label %out
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i32 3, label %out
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; CHECK-NEXT: !prof ![[MD0:[0-9]+]]
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], !prof !{!"branch_weights", i32 99, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6}
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out:
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%p = phi i32 [ 1, %entry ], [ -1, %negative ], [ -1, %negative ], [ -1, %negative ], [ -1, %negative ], [ -1, %negative ]
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ret i32 %p
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next:
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%q = phi i32 [ 0, %negative ], [ 0, %negative ]
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ret i32 %q
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}
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; Removed all cases from switch.
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define i32 @switch2(i32 %s) {
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; CHECK-LABEL: @switch2(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i32 [[S:%.*]], 0
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; CHECK-NEXT: br i1 [[CMP]], label [[POSITIVE:%.*]], label [[OUT:%.*]]
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;
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entry:
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%cmp = icmp sgt i32 %s, 0
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br i1 %cmp, label %positive, label %out
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positive:
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switch i32 %s, label %out [
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i32 0, label %out
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i32 -1, label %next
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i32 -2, label %next
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], !prof !{!"branch_weights", i32 99, i32 1, i32 2, i32 3}
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out:
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%p = phi i32 [ -1, %entry ], [ 1, %positive ], [ 1, %positive ]
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ret i32 %p
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next:
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%q = phi i32 [ 0, %positive ], [ 0, %positive ]
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ret i32 %q
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}
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; Change switch into conditional branch.
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define i32 @switch3(i32 %s) {
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; CHECK-LABEL: @switch3(
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;
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entry:
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%cmp = icmp sgt i32 %s, 0
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br i1 %cmp, label %positive, label %out
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positive:
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; CHECK: positive:
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; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 %s, 1
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; CHECK-NEXT: br i1 [[CMP]], label [[NEXT:%.*]], label [[OUT:%.*]], !prof ![[MD1:[0-9]+]]
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switch i32 %s, label %out [
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i32 1, label %next
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i32 -1, label %next
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i32 -2, label %next
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], !prof !{!"branch_weights", i32 99, i32 1, i32 2, i32 3}
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out:
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%p = phi i32 [ -1, %entry ], [ 1, %positive ]
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ret i32 %p
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next:
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%q = phi i32 [ 0, %positive ], [ 0, %positive ], [ 0, %positive ]
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ret i32 %q
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}
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; Removed all cases from switch.
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define i32 @switch4(i32 %s) {
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; CHECK-LABEL: @switch4(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[S:%.*]], 0
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; CHECK-NEXT: br i1 [[CMP]], label [[NEGATIVE:%.*]], label [[OUT:%.*]]
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;
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entry:
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%cmp = icmp slt i32 %s, 0
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br i1 %cmp, label %negative, label %out
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negative:
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; CHECK: negative:
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; CHECK-NEXT: br label %out
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switch i32 %s, label %out [
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i32 0, label %out
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i32 1, label %out
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i32 2, label %out
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i32 3, label %out
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], !prof !{!"branch_weights", i32 99, i32 1, i32 2, i32 3, i32 4}
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out:
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%p = phi i32 [ 1, %entry ], [ -1, %negative ], [ -1, %negative ], [ -1, %negative ], [ -1, %negative ], [ -1, %negative ]
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ret i32 %p
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}
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; CHECK: ![[MD0]] = !{!"branch_weights", i32 99, i32 4, i32 3}
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; CHECK: ![[MD1]] = !{!"branch_weights", i32 1, i32 99}
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