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nontrivial-unswitch-trivial-select.ll
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nontrivial-unswitch-trivial-select.ll
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes='simple-loop-unswitch<nontrivial>' -S < %s | FileCheck %s
; If we try to replace uses of `true` outside of `@foo`, we'll see it here.
define i1 @bar() {
; CHECK-LABEL: @bar(
; CHECK-NEXT: ret i1 true
;
ret i1 true
}
; We shouldn't unswitch this loop.
define void @foo() {
; CHECK-LABEL: @foo(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[HEADER:%.*]]
; CHECK: header:
; CHECK-NEXT: [[VAL:%.*]] = select i1 true, i1 true, i1 false
; CHECK-NEXT: br i1 [[VAL]], label [[EXIT:%.*]], label [[HEADER]]
; CHECK: exit:
; CHECK-NEXT: ret void
;
entry:
br label %header
header:
%val = select i1 true, i1 true, i1 false
br i1 %val, label %exit, label %header
exit:
ret void
}
define void @unswitch_trivial_select(i1 %c.1, i1 %c.2, i8 %a) {
; CHECK-LABEL: @unswitch_trivial_select(
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 [[C_1:%.*]], label [[PH_1:%.*]], label [[EXIT:%.*]]
; CHECK: ph.1:
; CHECK-NEXT: br i1 [[C_2:%.*]], label [[PH_2:%.*]], label [[EXIT]]
; CHECK: ph.2:
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i8 [[A:%.*]], 30
; CHECK-NEXT: [[SEL:%.*]] = select i1 [[CMP]], i1 true, i1 false
; CHECK-NEXT: [[CMP_FR:%.*]] = freeze i1 [[CMP]]
; CHECK-NEXT: br i1 [[CMP_FR]], label [[PH_2_SPLIT_US:%.*]], label [[PH_2_SPLIT:%.*]]
; CHECK: ph.2.split.us:
; CHECK-NEXT: br label [[LOOP_US:%.*]]
; CHECK: loop.us:
; CHECK-NEXT: call void @foo()
; CHECK-NEXT: br label [[EXIT_LOOPEXIT_SPLIT_US:%.*]]
; CHECK: exit.loopexit.split.us:
; CHECK-NEXT: br label [[EXIT_LOOPEXIT:%.*]]
; CHECK: ph.2.split:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: call void @foo()
; CHECK-NEXT: br label [[LOOP_LATCH:%.*]]
; CHECK: loop.latch:
; CHECK-NEXT: br label [[LOOP]]
; CHECK: exit.loopexit:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: ret void
;
entry:
br i1 %c.1, label %ph.1, label %exit
ph.1:
br i1 %c.2, label %ph.2, label %exit
ph.2:
%cmp = icmp eq i8 %a, 30
%sel = select i1 %cmp, i1 true, i1 false
br label %loop
loop:
call void @foo()
br i1 %sel, label %exit, label %loop.latch
loop.latch:
br label %loop
exit:
ret void
}
; Test case for PR55697.
define i32 @unswitch_trivial_select_cmp_outside(i32 %x) {
; CHECK-LABEL: @unswitch_trivial_select_cmp_outside(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[C:%.*]] = icmp ult i32 [[X:%.*]], 100
; CHECK-NEXT: br i1 [[C]], label [[ENTRY_SPLIT_US:%.*]], label [[ENTRY_SPLIT:%.*]]
; CHECK: entry.split.us:
; CHECK-NEXT: br label [[LOOP_US:%.*]]
; CHECK: loop.us:
; CHECK-NEXT: [[P_US:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT_US]] ], [ 35, [[LOOP_US]] ]
; CHECK-NEXT: br label [[LOOP_US]]
; CHECK: entry.split:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[P:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT]] ]
; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 false, i1 true, i1 false
; CHECK-NEXT: br label [[EXIT:%.*]]
; CHECK: exit:
; CHECK-NEXT: [[LCSSA:%.*]] = phi i32 [ [[P]], [[LOOP]] ]
; CHECK-NEXT: ret i32 [[LCSSA]]
;
entry:
%c = icmp ult i32 %x, 100
br label %loop
loop:
%p = phi i32 [ 0, %entry ], [ 35, %loop ]
%spec.select = select i1 %c, i1 true, i1 false
br i1 %spec.select, label %loop, label %exit
exit:
%lcssa = phi i32 [ %p, %loop ]
ret i32 %lcssa
}