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[LoopUnswitch] Add some additional tests. 

Add a few additional tests where partial unswitching is not really
profitable and should be avoided.
This commit is contained in:
Florian Hahn 2021-01-22 22:47:43 +00:00
parent 110837fbf6
commit b2b2aa1c60
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GPG Key ID: 61D7554B5CECDC0D
1 changed files with 86 additions and 0 deletions
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86
llvm/test/Transforms/LoopUnswitch/partial-unswitch.ll
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@ -827,3 +827,89 @@ loop.latch:
exit:
ret i32 10
}
define i32 @no_partial_unswitch_true_successor_exit(i32* %ptr, i32 %N) {
; CHECK-LABEL: @no_partial_unswitch_true_successor_exit
; CHECK-LABEL: entry:
; CHECK-NEXT: [[LV:%[0-9]+]] = load i32, i32* %ptr, align 4
; CHECK-NEXT: [[C:%[0-9]+]] = icmp eq i32 [[LV]], 100
; CHECK-NEXT: br i1 [[C]],
;
entry:
br label %loop.header
loop.header:
%iv = phi i32 [ 0, %entry ], [ %iv.next, %loop.latch ]
%lv = load i32, i32* %ptr
%sc = icmp eq i32 %lv, 100
br i1 %sc, label %exit, label %clobber
clobber:
call void @clobber()
br label %loop.latch
loop.latch:
%c = icmp ult i32 %iv, %N
%iv.next = add i32 %iv, 1
br i1 %c, label %loop.header, label %exit
exit:
ret i32 10
}
define i32 @no_partial_unswitch_true_same_successor(i32* %ptr, i32 %N) {
; CHECK-LABEL: @no_partial_unswitch_true_same_successor
; CHECK-LABEL: entry:
; CHECK-NEXT: [[LV:%[0-9]+]] = load i32, i32* %ptr, align 4
; CHECK-NEXT: [[C:%[0-9]+]] = icmp eq i32 [[LV]], 100
; CHECK-NEXT: br i1 [[C]],
;
entry:
br label %loop.header
loop.header:
%iv = phi i32 [ 0, %entry ], [ %iv.next, %loop.latch ]
%lv = load i32, i32* %ptr
%sc = icmp eq i32 %lv, 100
br i1 %sc, label %noclobber, label %noclobber
noclobber:
br label %loop.latch
loop.latch:
%c = icmp ult i32 %iv, %N
%iv.next = add i32 %iv, 1
br i1 %c, label %loop.header, label %exit
exit:
ret i32 10
}
define i32 @partial_unswitch_true_to_latch(i32* %ptr, i32 %N) {
; CHECK-LABEL: @partial_unswitch_true_to_latch
; CHECK-LABEL: entry:
; CHECK-NEXT: [[LV:%[0-9]+]] = load i32, i32* %ptr, align 4
; CHECK-NEXT: [[C:%[0-9]+]] = icmp eq i32 [[LV]], 100
; CHECK-NEXT: br i1 [[C]],
;
entry:
br label %loop.header
loop.header:
%iv = phi i32 [ 0, %entry ], [ %iv.next, %loop.latch ]
%lv = load i32, i32* %ptr
%sc = icmp eq i32 %lv, 100
br i1 %sc, label %loop.latch, label %clobber
clobber:
call void @clobber()
br label %loop.latch
loop.latch:
%c = icmp ult i32 %iv, %N
%iv.next = add i32 %iv, 1
br i1 %c, label %loop.header, label %exit
exit:
ret i32 10
}