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