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[InstCombine] Add tests for logical and/or poison implication (NFC) 

These tests cover some cases where we can fold select to and/or
based on poison implication logic.
This commit is contained in:
Nikita Popov 2021-01-12 22:15:54 +01:00
parent 7583ae48a3
commit e15f3ddcae
1 changed files with 96 additions and 0 deletions
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96
llvm/test/Transforms/InstCombine/select-and-or.ll
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@ -85,3 +85,99 @@ define i1 @logical_or_not_cond_reuse(i1 %a, i1 %b) {
%res = select i1 %a, i1 %a.not, i1 %b %res = select i1 %a, i1 %a.not, i1 %b
ret i1 %res ret i1 %res
} }
; Safe to convert to or due to poison implication.
define i1 @logical_or_implies(i32 %x) {
; CHECK-LABEL: @logical_or_implies(
; CHECK-NEXT: [[C1:%.*]] = icmp eq i32 [[X:%.*]], 0
; CHECK-NEXT: [[C2:%.*]] = icmp eq i32 [[X]], 42
; CHECK-NEXT: [[RES:%.*]] = select i1 [[C1]], i1 true, i1 [[C2]]
; CHECK-NEXT: ret i1 [[RES]]
;
%c1 = icmp eq i32 %x, 0
%c2 = icmp eq i32 %x, 42
%res = select i1 %c1, i1 true, i1 %c2
ret i1 %res
}
; Will fold after conversion to or.
define i1 @logical_or_implies_folds(i32 %x) {
; CHECK-LABEL: @logical_or_implies_folds(
; CHECK-NEXT: [[C1:%.*]] = icmp slt i32 [[X:%.*]], 0
; CHECK-NEXT: [[C2:%.*]] = icmp sgt i32 [[X]], -1
; CHECK-NEXT: [[RES:%.*]] = select i1 [[C1]], i1 true, i1 [[C2]]
; CHECK-NEXT: ret i1 [[RES]]
;
%c1 = icmp slt i32 %x, 0
%c2 = icmp sge i32 %x, 0
%res = select i1 %c1, i1 true, i1 %c2
ret i1 %res
}
; Safe to convert to and due to poison implication.
define i1 @logical_and_implies(i32 %x) {
; CHECK-LABEL: @logical_and_implies(
; CHECK-NEXT: [[C1:%.*]] = icmp ne i32 [[X:%.*]], 0
; CHECK-NEXT: [[C2:%.*]] = icmp ne i32 [[X]], 42
; CHECK-NEXT: [[RES:%.*]] = select i1 [[C1]], i1 [[C2]], i1 false
; CHECK-NEXT: ret i1 [[RES]]
;
%c1 = icmp ne i32 %x, 0
%c2 = icmp ne i32 %x, 42
%res = select i1 %c1, i1 %c2, i1 false
ret i1 %res
}
; Will fold after conversion to and.
define i1 @logical_and_implies_folds(i32 %x) {
; CHECK-LABEL: @logical_and_implies_folds(
; CHECK-NEXT: [[C1:%.*]] = icmp ugt i32 [[X:%.*]], 42
; CHECK-NEXT: [[C2:%.*]] = icmp ne i32 [[X]], 0
; CHECK-NEXT: [[RES:%.*]] = select i1 [[C1]], i1 [[C2]], i1 false
; CHECK-NEXT: ret i1 [[RES]]
;
%c1 = icmp ugt i32 %x, 42
%c2 = icmp ne i32 %x, 0
%res = select i1 %c1, i1 %c2, i1 false
ret i1 %res
}
; Noundef on condition has no effect.
define i1 @logical_or_noundef_a(i1 noundef %a, i1 %b) {
; CHECK-LABEL: @logical_or_noundef_a(
; CHECK-NEXT: [[RES:%.*]] = select i1 [[A:%.*]], i1 true, i1 [[B:%.*]]
; CHECK-NEXT: ret i1 [[RES]]
;
%res = select i1 %a, i1 true, i1 %b
ret i1 %res
}
; Noundef on false value allows conversion to or.
define i1 @logical_or_noundef_b(i1 %a, i1 noundef %b) {
; CHECK-LABEL: @logical_or_noundef_b(
; CHECK-NEXT: [[RES:%.*]] = select i1 [[A:%.*]], i1 true, i1 [[B:%.*]]
; CHECK-NEXT: ret i1 [[RES]]
;
%res = select i1 %a, i1 true, i1 %b
ret i1 %res
}
; Noundef on condition has no effect.
define i1 @logical_and_noundef_a(i1 noundef %a, i1 %b) {
; CHECK-LABEL: @logical_and_noundef_a(
; CHECK-NEXT: [[RES:%.*]] = select i1 [[A:%.*]], i1 [[B:%.*]], i1 false
; CHECK-NEXT: ret i1 [[RES]]
;
%res = select i1 %a, i1 %b, i1 false
ret i1 %res
}
; Noundef on false value allows conversion to and.
define i1 @logical_and_noundef_b(i1 %a, i1 noundef %b) {
; CHECK-LABEL: @logical_and_noundef_b(
; CHECK-NEXT: [[RES:%.*]] = select i1 [[A:%.*]], i1 [[B:%.*]], i1 false
; CHECK-NEXT: ret i1 [[RES]]
;
%res = select i1 %a, i1 %b, i1 false
ret i1 %res
}