46 lines
1.1 KiB
LLVM
46 lines
1.1 KiB
LLVM
; RUN: opt < %s -simple-loop-unswitch -enable-nontrivial-unswitch -S 2>&1 | FileCheck %s
|
|
; RUN: opt < %s -passes=unswitch -enable-nontrivial-unswitch -S 2>&1 | FileCheck %s
|
|
;
|
|
; Checking that (dead) blocks from inner loop are deleted after unswitch.
|
|
;
|
|
declare void @foo()
|
|
|
|
; CHECK-LABEL: @Test
|
|
define void @Test(i32) {
|
|
entry:
|
|
br label %outer
|
|
outer:
|
|
%oi = phi i32 [ 0, %entry ], [ %oinc, %outer_continue]
|
|
br label %inner
|
|
inner:
|
|
%ii = phi i32 [ 0, %outer ], [ %iinc, %continue]
|
|
call void @foo()
|
|
switch i32 %0, label %get_out2 [
|
|
i32 0, label %continue
|
|
i32 1, label %case1
|
|
i32 2, label %get_out
|
|
]
|
|
;
|
|
; since we unswitch on the above switch, %case1 and %continue blocks
|
|
; become dead in the original loop
|
|
;
|
|
; CHECK-NOT: case1:
|
|
case1:
|
|
br label %continue
|
|
; CHECK-NOT: {{^}}continue:
|
|
continue:
|
|
%iinc = add i32 %ii, 1
|
|
%icmp = icmp eq i32 %ii, 100
|
|
br i1 %icmp, label %inner, label %outer_continue
|
|
|
|
outer_continue:
|
|
%oinc = add i32 %oi, 1
|
|
%ocmp = icmp eq i32 %oi, 100
|
|
br i1 %ocmp, label %outer, label %get_out
|
|
|
|
get_out:
|
|
ret void
|
|
get_out2:
|
|
unreachable
|
|
}
|