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llvm-project/llvm/test/Transforms/LoopUnroll/peel-last-iteration-with-variable-trip-count.ll
Philip Reames 4e706adc5e [LoopPeel] Add test coverage for edge case for peel last 
Add coverage for two cases:
1) Handling of the two transition edge case with equality conditions
   when last iteration is both first and second transition.
2) Need to handle inverted predicates
2025-06-10 11:46:06 -07:00

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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
; RUN: opt -p loop-unroll -unroll-full-max-count=0 -S %s | FileCheck %s
declare void @foo(i32)
define i32 @peel_last_with_trip_count_check_lcssa_phi(i32 %n) {
; CHECK-LABEL: define i32 @peel_last_with_trip_count_check_lcssa_phi(
; CHECK-SAME: i32 [[N:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*]]:
; CHECK-NEXT: [[SUB:%.*]] = add i32 [[N]], -1
; CHECK-NEXT: [[TMP0:%.*]] = icmp ne i32 [[SUB]], 0
; CHECK-NEXT: br i1 [[TMP0]], label %[[ENTRY_SPLIT:.*]], label %[[EXIT_PEEL_BEGIN:.*]]
; CHECK: [[ENTRY_SPLIT]]:
; CHECK-NEXT: br label %[[LOOP:.*]]
; CHECK: [[LOOP]]:
; CHECK-NEXT: [[IV1:%.*]] = phi i32 [ 0, %[[ENTRY_SPLIT]] ], [ [[IV_NEXT1:%.*]], %[[LOOP]] ]
; CHECK-NEXT: call void @foo(i32 2)
; CHECK-NEXT: [[IV_NEXT1]] = add nuw i32 [[IV1]], 1
; CHECK-NEXT: [[TMP1:%.*]] = sub i32 [[N]], 1
; CHECK-NEXT: [[EC1:%.*]] = icmp ne i32 [[IV_NEXT1]], [[TMP1]]
; CHECK-NEXT: br i1 [[EC1]], label %[[LOOP]], label %[[EXIT_PEEL_BEGIN_LOOPEXIT:.*]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK: [[EXIT_PEEL_BEGIN_LOOPEXIT]]:
; CHECK-NEXT: [[DOTPH:%.*]] = phi i32 [ [[IV_NEXT1]], %[[LOOP]] ]
; CHECK-NEXT: br label %[[EXIT_PEEL_BEGIN]]
; CHECK: [[EXIT_PEEL_BEGIN]]:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, %[[ENTRY]] ], [ [[DOTPH]], %[[EXIT_PEEL_BEGIN_LOOPEXIT]] ]
; CHECK-NEXT: br label %[[LOOP_PEEL:.*]]
; CHECK: [[LOOP_PEEL]]:
; CHECK-NEXT: [[C:%.*]] = icmp eq i32 [[IV]], [[SUB]]
; CHECK-NEXT: [[SEL:%.*]] = select i1 [[C]], i32 1, i32 2
; CHECK-NEXT: call void @foo(i32 [[SEL]])
; CHECK-NEXT: [[IV_NEXT:%.*]] = add i32 [[IV]], 1
; CHECK-NEXT: [[EC:%.*]] = icmp ne i32 [[IV_NEXT]], [[N]]
; CHECK-NEXT: br i1 [[EC]], label %[[EXIT_PEEL_NEXT:.*]], label %[[EXIT_PEEL_NEXT]]
; CHECK: [[EXIT_PEEL_NEXT]]:
; CHECK-NEXT: br label %[[LOOP_PEEL_NEXT:.*]]
; CHECK: [[LOOP_PEEL_NEXT]]:
; CHECK-NEXT: br label %[[EXIT:.*]]
; CHECK: [[EXIT]]:
; CHECK-NEXT: ret i32 [[SEL]]
;
entry:
%sub = add i32 %n, -1
br label %loop
loop:
%iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
%c = icmp eq i32 %iv, %sub
%sel = select i1 %c, i32 1, i32 2
call void @foo(i32 %sel)
%iv.next = add i32 %iv, 1
%ec = icmp ne i32 %iv.next, %n
br i1 %ec, label %loop, label %exit
exit:
%sel.lcssa = phi i32 [ %sel, %loop ]
ret i32 %sel.lcssa
}
define i32 @peel_last_with_trip_count_check_lcssa_phi_step_2(i32 %n) {
; CHECK-LABEL: define i32 @peel_last_with_trip_count_check_lcssa_phi_step_2(
; CHECK-SAME: i32 [[N:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*]]:
; CHECK-NEXT: [[SUB:%.*]] = add i32 [[N]], -2
; CHECK-NEXT: br label %[[LOOP:.*]]
; CHECK: [[LOOP]]:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, %[[ENTRY]] ], [ [[IV_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT: [[C:%.*]] = icmp eq i32 [[IV]], [[SUB]]
; CHECK-NEXT: [[SEL:%.*]] = select i1 [[C]], i32 1, i32 2
; CHECK-NEXT: call void @foo(i32 [[SEL]])
; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], 2
; CHECK-NEXT: [[EC:%.*]] = icmp ne i32 [[IV_NEXT]], [[N]]
; CHECK-NEXT: br i1 [[EC]], label %[[LOOP]], label %[[EXIT:.*]]
; CHECK: [[EXIT]]:
; CHECK-NEXT: [[SEL_LCSSA:%.*]] = phi i32 [ [[SEL]], %[[LOOP]] ]
; CHECK-NEXT: ret i32 [[SEL_LCSSA]]
;
entry:
%sub = add i32 %n, -2
br label %loop
loop:
%iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
%c = icmp eq i32 %iv, %sub
%sel = select i1 %c, i32 1, i32 2
call void @foo(i32 %sel)
%iv.next = add i32 %iv, 2
%ec = icmp ne i32 %iv.next, %n
br i1 %ec, label %loop, label %exit
exit:
%sel.lcssa = phi i32 [ %sel, %loop ]
ret i32 %sel.lcssa
}
define i64 @peel_single_block_loop_iv_step_1_may_execute_only_once(i64 %n) {
; CHECK-LABEL: define i64 @peel_single_block_loop_iv_step_1_may_execute_only_once(
; CHECK-SAME: i64 [[N:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*]]:
; CHECK-NEXT: [[N_NOT_0:%.*]] = icmp ne i64 [[N]], 0
; CHECK-NEXT: call void @llvm.assume(i1 [[N_NOT_0]])
; CHECK-NEXT: [[SUB:%.*]] = add nsw i64 [[N]], 1
; CHECK-NEXT: br label %[[LOOP:.*]]
; CHECK: [[LOOP]]:
; CHECK-NEXT: [[IV:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[IV_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT: [[CMP18_NOT:%.*]] = icmp eq i64 [[IV]], [[N]]
; CHECK-NEXT: [[COND:%.*]] = select i1 [[CMP18_NOT]], i32 10, i32 20
; CHECK-NEXT: call void @foo(i32 [[COND]])
; CHECK-NEXT: [[IV_NEXT]] = add i64 [[IV]], 1
; CHECK-NEXT: [[EC:%.*]] = icmp ne i64 [[IV_NEXT]], [[N]]
; CHECK-NEXT: br i1 [[EC]], label %[[LOOP]], label %[[EXIT:.*]]
; CHECK: [[EXIT]]:
; CHECK-NEXT: [[IV_LCSSA:%.*]] = phi i64 [ [[IV]], %[[LOOP]] ]
; CHECK-NEXT: ret i64 [[IV_LCSSA]]
;
entry:
%n.not.0 = icmp ne i64 %n, 0
call void @llvm.assume(i1 %n.not.0)
%sub = add nsw i64 %n, 1
br label %loop
loop:
%iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
%cmp = icmp eq i64 %iv, %n
%cond = select i1 %cmp, i32 10, i32 20
call void @foo(i32 %cond)
%iv.next = add i64 %iv, 1
%ec = icmp ne i64 %iv.next, %n
br i1 %ec, label %loop, label %exit
exit:
ret i64 %iv
}
define i32 @peel_last_with_trip_count_check_lcssa_phi_cmp_not_invar(i32 %n) {
; CHECK-LABEL: define i32 @peel_last_with_trip_count_check_lcssa_phi_cmp_not_invar(
; CHECK-SAME: i32 [[N:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*]]:
; CHECK-NEXT: [[SUB:%.*]] = add i32 [[N]], -2
; CHECK-NEXT: br label %[[LOOP:.*]]
; CHECK: [[LOOP]]:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, %[[ENTRY]] ], [ [[IV_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT: [[C:%.*]] = icmp eq i32 [[IV]], [[SUB]]
; CHECK-NEXT: [[SEL:%.*]] = select i1 [[C]], i32 1, i32 2
; CHECK-NEXT: call void @foo(i32 [[SEL]])
; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], 1
; CHECK-NEXT: [[EC:%.*]] = icmp ne i32 [[IV_NEXT]], [[N]]
; CHECK-NEXT: br i1 [[EC]], label %[[LOOP]], label %[[EXIT:.*]]
; CHECK: [[EXIT]]:
; CHECK-NEXT: [[SEL_LCSSA:%.*]] = phi i32 [ [[SEL]], %[[LOOP]] ]
; CHECK-NEXT: ret i32 [[SEL_LCSSA]]
;
entry:
%sub = add i32 %n, -2
br label %loop
loop:
%iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
%c = icmp eq i32 %iv, %sub
%sel = select i1 %c, i32 1, i32 2
call void @foo(i32 %sel)
%iv.next = add i32 %iv, 1
%ec = icmp ne i32 %iv.next, %n
br i1 %ec, label %loop, label %exit
exit:
%sel.lcssa = phi i32 [ %sel, %loop ]
ret i32 %sel.lcssa
}
define i32 @peel_last_with_trip_count_check_lcssa_phi_cmp_not_invar2(i32 %n) {
; CHECK-LABEL: define i32 @peel_last_with_trip_count_check_lcssa_phi_cmp_not_invar2(
; CHECK-SAME: i32 [[N:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*]]:
; CHECK-NEXT: [[SUB:%.*]] = add i32 [[N]], -2
; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[N]], -1
; CHECK-NEXT: [[TMP1:%.*]] = icmp ne i32 [[TMP0]], 0
; CHECK-NEXT: br i1 [[TMP1]], label %[[ENTRY_SPLIT:.*]], label %[[EXIT_PEEL_BEGIN:.*]]
; CHECK: [[ENTRY_SPLIT]]:
; CHECK-NEXT: br label %[[LOOP:.*]]
; CHECK: [[LOOP]]:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, %[[ENTRY_SPLIT]] ], [ [[IV_NEXT1:%.*]], %[[LOOP]] ]
; CHECK-NEXT: [[C:%.*]] = icmp ne i32 [[IV]], [[SUB]]
; CHECK-NEXT: [[SEL:%.*]] = select i1 [[C]], i32 1, i32 2
; CHECK-NEXT: call void @foo(i32 [[SEL]])
; CHECK-NEXT: [[IV_NEXT1]] = add nuw i32 [[IV]], 1
; CHECK-NEXT: [[TMP2:%.*]] = sub i32 [[N]], 1
; CHECK-NEXT: [[EC1:%.*]] = icmp ne i32 [[IV_NEXT1]], [[TMP2]]
; CHECK-NEXT: br i1 [[EC1]], label %[[LOOP]], label %[[EXIT_PEEL_BEGIN_LOOPEXIT:.*]], !llvm.loop [[LOOP2:![0-9]+]]
; CHECK: [[EXIT_PEEL_BEGIN_LOOPEXIT]]:
; CHECK-NEXT: [[DOTPH:%.*]] = phi i32 [ [[IV_NEXT1]], %[[LOOP]] ]
; CHECK-NEXT: br label %[[EXIT_PEEL_BEGIN]]
; CHECK: [[EXIT_PEEL_BEGIN]]:
; CHECK-NEXT: [[TMP3:%.*]] = phi i32 [ 0, %[[ENTRY]] ], [ [[DOTPH]], %[[EXIT_PEEL_BEGIN_LOOPEXIT]] ]
; CHECK-NEXT: br label %[[LOOP_PEEL:.*]]
; CHECK: [[LOOP_PEEL]]:
; CHECK-NEXT: [[C_PEEL:%.*]] = icmp ne i32 [[TMP3]], [[SUB]]
; CHECK-NEXT: [[SEL_LCSSA:%.*]] = select i1 [[C_PEEL]], i32 1, i32 2
; CHECK-NEXT: call void @foo(i32 [[SEL_LCSSA]])
; CHECK-NEXT: [[IV_NEXT:%.*]] = add i32 [[TMP3]], 1
; CHECK-NEXT: [[EC:%.*]] = icmp ne i32 [[IV_NEXT]], [[N]]
; CHECK-NEXT: br i1 [[EC]], label %[[EXIT_PEEL_NEXT:.*]], label %[[EXIT_PEEL_NEXT]]
; CHECK: [[EXIT_PEEL_NEXT]]:
; CHECK-NEXT: br label %[[LOOP_PEEL_NEXT:.*]]
; CHECK: [[LOOP_PEEL_NEXT]]:
; CHECK-NEXT: br label %[[EXIT:.*]]
; CHECK: [[EXIT]]:
; CHECK-NEXT: ret i32 [[SEL_LCSSA]]
;
entry:
%sub = add i32 %n, -2
br label %loop
loop:
%iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
%c = icmp ne i32 %iv, %sub
%sel = select i1 %c, i32 1, i32 2
call void @foo(i32 %sel)
%iv.next = add i32 %iv, 1
%ec = icmp ne i32 %iv.next, %n
br i1 %ec, label %loop, label %exit
exit:
%sel.lcssa = phi i32 [ %sel, %loop ]
ret i32 %sel.lcssa
}
define i32 @peel_last_with_trip_count_check_lcssa_phi_cmp_not_invar3(i32 %n) {
; CHECK-LABEL: define i32 @peel_last_with_trip_count_check_lcssa_phi_cmp_not_invar3(
; CHECK-SAME: i32 [[N:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*]]:
; CHECK-NEXT: [[SUB:%.*]] = add i32 [[N]], -1
; CHECK-NEXT: [[TMP0:%.*]] = icmp ne i32 [[SUB]], 0
; CHECK-NEXT: br i1 [[TMP0]], label %[[ENTRY_SPLIT:.*]], label %[[EXIT_PEEL_BEGIN:.*]]
; CHECK: [[ENTRY_SPLIT]]:
; CHECK-NEXT: br label %[[LOOP:.*]]
; CHECK: [[LOOP]]:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, %[[ENTRY_SPLIT]] ], [ [[IV_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT: call void @foo(i32 2)
; CHECK-NEXT: [[IV_NEXT]] = add nuw i32 [[IV]], 1
; CHECK-NEXT: [[TMP1:%.*]] = sub i32 [[N]], 1
; CHECK-NEXT: [[EC:%.*]] = icmp ne i32 [[IV_NEXT]], [[TMP1]]
; CHECK-NEXT: br i1 [[EC]], label %[[LOOP]], label %[[EXIT_PEEL_BEGIN_LOOPEXIT:.*]], !llvm.loop [[LOOP3:![0-9]+]]
; CHECK: [[EXIT_PEEL_BEGIN_LOOPEXIT]]:
; CHECK-NEXT: [[DOTPH:%.*]] = phi i32 [ [[IV_NEXT]], %[[LOOP]] ]
; CHECK-NEXT: br label %[[EXIT_PEEL_BEGIN]]
; CHECK: [[EXIT_PEEL_BEGIN]]:
; CHECK-NEXT: [[TMP2:%.*]] = phi i32 [ 0, %[[ENTRY]] ], [ [[DOTPH]], %[[EXIT_PEEL_BEGIN_LOOPEXIT]] ]
; CHECK-NEXT: br label %[[LOOP_PEEL:.*]]
; CHECK: [[LOOP_PEEL]]:
; CHECK-NEXT: [[C_PEEL:%.*]] = icmp eq i32 [[TMP2]], [[SUB]]
; CHECK-NEXT: [[SEL_PEEL:%.*]] = select i1 [[C_PEEL]], i32 1, i32 2
; CHECK-NEXT: call void @foo(i32 [[SEL_PEEL]])
; CHECK-NEXT: [[IV_NEXT_PEEL:%.*]] = add i32 [[TMP2]], 1
; CHECK-NEXT: [[EC_PEEL:%.*]] = icmp ne i32 [[IV_NEXT_PEEL]], [[N]]
; CHECK-NEXT: br i1 [[EC_PEEL]], label %[[EXIT_PEEL_NEXT:.*]], label %[[EXIT_PEEL_NEXT]]
; CHECK: [[EXIT_PEEL_NEXT]]:
; CHECK-NEXT: br label %[[LOOP_PEEL_NEXT:.*]]
; CHECK: [[LOOP_PEEL_NEXT]]:
; CHECK-NEXT: br label %[[EXIT:.*]]
; CHECK: [[EXIT]]:
; CHECK-NEXT: ret i32 [[SEL_PEEL]]
;
entry:
%sub = add i32 %n, -1
br label %loop
loop:
%iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
%c = icmp eq i32 %iv, %sub
%sel = select i1 %c, i32 1, i32 2
call void @foo(i32 %sel)
%iv.next = add i32 %iv, 1
%ec = icmp ne i32 %iv.next, %n
br i1 %ec, label %loop, label %exit
exit:
%sel.lcssa = phi i32 [ %sel, %loop ]
ret i32 %sel.lcssa
}
define i32 @peel_last_with_trip_count_check_lcssa_phi_cmp_not_invar4(i32 %n) {
; CHECK-LABEL: define i32 @peel_last_with_trip_count_check_lcssa_phi_cmp_not_invar4(
; CHECK-SAME: i32 [[N:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*]]:
; CHECK-NEXT: [[SUB:%.*]] = add i32 [[N]], -1
; CHECK-NEXT: br label %[[LOOP:.*]]
; CHECK: [[LOOP]]:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, %[[ENTRY]] ], [ [[IV_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT: [[C:%.*]] = icmp ne i32 [[IV]], [[SUB]]
; CHECK-NEXT: [[SEL:%.*]] = select i1 [[C]], i32 1, i32 2
; CHECK-NEXT: call void @foo(i32 [[SEL]])
; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], 1
; CHECK-NEXT: [[EC:%.*]] = icmp ne i32 [[IV_NEXT]], [[N]]
; CHECK-NEXT: br i1 [[EC]], label %[[LOOP]], label %[[EXIT:.*]]
; CHECK: [[EXIT]]:
; CHECK-NEXT: [[SEL_LCSSA:%.*]] = phi i32 [ [[SEL]], %[[LOOP]] ]
; CHECK-NEXT: ret i32 [[SEL_LCSSA]]
;
entry:
%sub = add i32 %n, -1
br label %loop
loop:
%iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
%c = icmp ne i32 %iv, %sub
%sel = select i1 %c, i32 1, i32 2
call void @foo(i32 %sel)
%iv.next = add i32 %iv, 1
%ec = icmp ne i32 %iv.next, %n
br i1 %ec, label %loop, label %exit
exit:
%sel.lcssa = phi i32 [ %sel, %loop ]
ret i32 %sel.lcssa
}
define void @peel_last_with_trip_count_check_nested_loop(i32 %n) {
; CHECK-LABEL: define void @peel_last_with_trip_count_check_nested_loop(
; CHECK-SAME: i32 [[N:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*:]]
; CHECK-NEXT: [[SUB:%.*]] = add i32 [[N]], -1
; CHECK-NEXT: br label %[[OUTER_HEADER:.*]]
; CHECK: [[OUTER_HEADER_LOOPEXIT_PEEL_BEGIN_LOOPEXIT:.*]]:
; CHECK-NEXT: [[DOTPH:%.*]] = phi i32 [ [[IV_NEXT1:%.*]], %[[INNER_LATCH:.*]] ]
; CHECK-NEXT: br label %[[OUTER_HEADER_LOOPEXIT_PEEL_BEGIN:.*]]
; CHECK: [[OUTER_HEADER_LOOPEXIT_PEEL_BEGIN]]:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, %[[OUTER_HEADER]] ], [ [[DOTPH]], %[[OUTER_HEADER_LOOPEXIT_PEEL_BEGIN_LOOPEXIT]] ]
; CHECK-NEXT: br label %[[INNER_HEADER_PEEL:.*]]
; CHECK: [[INNER_HEADER_PEEL]]:
; CHECK-NEXT: [[C:%.*]] = icmp eq i32 [[IV]], [[SUB]]
; CHECK-NEXT: br i1 [[C]], label %[[INNER_LATCH_PEEL:.*]], label %[[THEN_PEEL:.*]]
; CHECK: [[THEN_PEEL]]:
; CHECK-NEXT: call void @foo(i32 1)
; CHECK-NEXT: br label %[[INNER_LATCH_PEEL]]
; CHECK: [[INNER_LATCH_PEEL]]:
; CHECK-NEXT: [[IV_NEXT:%.*]] = add i32 [[IV]], 1
; CHECK-NEXT: [[EXITCOND_NOT:%.*]] = icmp eq i32 [[IV_NEXT]], [[N]]
; CHECK-NEXT: br i1 [[EXITCOND_NOT]], label %[[OUTER_HEADER_LOOPEXIT_PEEL_NEXT:.*]], label %[[OUTER_HEADER_LOOPEXIT_PEEL_NEXT]]
; CHECK: [[OUTER_HEADER_LOOPEXIT_PEEL_NEXT]]:
; CHECK-NEXT: br label %[[INNER_HEADER_PEEL_NEXT:.*]]
; CHECK: [[INNER_HEADER_PEEL_NEXT]]:
; CHECK-NEXT: br label %[[OUTER_HEADER_LOOPEXIT:.*]]
; CHECK: [[OUTER_HEADER_LOOPEXIT]]:
; CHECK-NEXT: br label %[[OUTER_HEADER]]
; CHECK: [[OUTER_HEADER]]:
; CHECK-NEXT: [[TMP1:%.*]] = icmp ne i32 [[SUB]], 0
; CHECK-NEXT: br i1 [[TMP1]], label %[[OUTER_HEADER_SPLIT:.*]], label %[[OUTER_HEADER_LOOPEXIT_PEEL_BEGIN]]
; CHECK: [[OUTER_HEADER_SPLIT]]:
; CHECK-NEXT: br label %[[INNER_HEADER:.*]]
; CHECK: [[INNER_HEADER]]:
; CHECK-NEXT: [[IV1:%.*]] = phi i32 [ 0, %[[OUTER_HEADER_SPLIT]] ], [ [[IV_NEXT1]], %[[INNER_LATCH]] ]
; CHECK-NEXT: br i1 false, label %[[INNER_LATCH]], label %[[THEN:.*]]
; CHECK: [[THEN]]:
; CHECK-NEXT: call void @foo(i32 1)
; CHECK-NEXT: br label %[[INNER_LATCH]]
; CHECK: [[INNER_LATCH]]:
; CHECK-NEXT: [[IV_NEXT1]] = add nuw i32 [[IV1]], 1
; CHECK-NEXT: [[TMP2:%.*]] = sub i32 [[N]], 1
; CHECK-NEXT: [[EXITCOND_NOT1:%.*]] = icmp eq i32 [[IV_NEXT1]], [[TMP2]]
; CHECK-NEXT: br i1 [[EXITCOND_NOT1]], label %[[OUTER_HEADER_LOOPEXIT_PEEL_BEGIN_LOOPEXIT]], label %[[INNER_HEADER]], !llvm.loop [[LOOP4:![0-9]+]]
;
entry:
%sub = add i32 %n, -1
br label %outer.header
outer.header:
br label %inner.header
inner.header:
%iv = phi i32 [ 0, %outer.header ], [ %iv.next, %inner.latch ]
%c = icmp eq i32 %iv, %sub
br i1 %c, label %inner.latch, label %then
then:
call void @foo(i32 1)
br label %inner.latch
inner.latch:
%iv.next = add i32 %iv, 1
%ec = icmp eq i32 %iv.next, %n
br i1 %ec, label %outer.header, label %inner.header
}
;.
; CHECK: [[LOOP0]] = distinct !{[[LOOP0]], [[META1:![0-9]+]]}
; CHECK: [[META1]] = !{!"llvm.loop.peeled.count", i32 1}
; CHECK: [[LOOP2]] = distinct !{[[LOOP2]], [[META1]]}
; CHECK: [[LOOP3]] = distinct !{[[LOOP3]], [[META1]]}
; CHECK: [[LOOP4]] = distinct !{[[LOOP4]], [[META1]]}
;.
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