forked from OSchip/llvm-project
48 lines
1.6 KiB
LLVM
48 lines
1.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
|
|
; RUN: opt -disable-output -print-mustexecute %s 2>&1 | FileCheck %s
|
|
; RUN: opt -disable-output -passes=print-mustexecute %s 2>&1 | FileCheck %s
|
|
|
|
; In general the CFG below is easily simplified but this is useful for
|
|
; pass ordering issue elimination.
|
|
define i1 @const_cond(i32 %high) {
|
|
; CHECK-LABEL: @const_cond(
|
|
; CHECK-NEXT: entry:
|
|
; CHECK-NEXT: br label [[LOOP:%.*]]
|
|
; CHECK: loop:
|
|
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ] ; (mustexec in: loop)
|
|
; CHECK-NEXT: br i1 true, label [[NEXT:%.*]], label [[NEVER1:%.*]] ; (mustexec in: loop)
|
|
; CHECK: next:
|
|
; CHECK-NEXT: br i1 false, label [[NEVER2:%.*]], label [[BACKEDGE]] ; (mustexec in: loop)
|
|
; CHECK: backedge:
|
|
; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i32 [[IV]], 1 ; (mustexec in: loop)
|
|
; CHECK-NEXT: [[EXIT_TEST:%.*]] = icmp slt i32 [[IV]], [[HIGH:%.*]] ; (mustexec in: loop)
|
|
; CHECK-NEXT: br i1 [[EXIT_TEST]], label [[LOOP]], label [[EXIT:%.*]] ; (mustexec in: loop)
|
|
; CHECK: exit:
|
|
; CHECK-NEXT: ret i1 false
|
|
; CHECK: never1:
|
|
; CHECK-NEXT: unreachable
|
|
; CHECK: never2:
|
|
; CHECK-NEXT: unreachable
|
|
;
|
|
entry:
|
|
br label %loop
|
|
|
|
loop:
|
|
%iv = phi i32 [0, %entry], [%iv.next, %backedge]
|
|
br i1 true, label %next, label %never1
|
|
next:
|
|
br i1 false, label %never2, label %backedge
|
|
backedge:
|
|
%iv.next = add nsw nuw i32 %iv, 1
|
|
%exit.test = icmp slt i32 %iv, %high
|
|
br i1 %exit.test, label %loop, label %exit
|
|
|
|
exit:
|
|
ret i1 false
|
|
never1:
|
|
unreachable
|
|
never2:
|
|
unreachable
|
|
}
|
|
|