[llvm] 32aea4b - [Test] Add test showing one more missing case of turn-to-invariant with widening

[Max Kazantsev via llvm-commits]

Author: Max Kazantsev
Date: 2023-01-11T13:07:38+07:00
New Revision: 32aea4bb84e3effebb329c13df68e27fa35f6baa

URL: https://github.com/llvm/llvm-project/commit/32aea4bb84e3effebb329c13df68e27fa35f6baa
DIFF: https://github.com/llvm/llvm-project/commit/32aea4bb84e3effebb329c13df68e27fa35f6baa.diff

LOG: [Test] Add test showing one more missing case of turn-to-invariant with widening

Added: 
    

Modified: 
    llvm/test/Transforms/IndVarSimplify/X86/widening-vs-and-elimination.ll

Removed: 
    


################################################################################
diff  --git a/llvm/test/Transforms/IndVarSimplify/X86/widening-vs-and-elimination.ll b/llvm/test/Transforms/IndVarSimplify/X86/widening-vs-and-elimination.ll
index cef5024beb88..fad21e9938c1 100644
--- a/llvm/test/Transforms/IndVarSimplify/X86/widening-vs-and-elimination.ll
+++ b/llvm/test/Transforms/IndVarSimplify/X86/widening-vs-and-elimination.ll
@@ -60,3 +60,82 @@ backedge:                                              ; preds = %loop
 exit:                                             ; preds = %loop
   ret void
 }
+
+define i32 @test_02(i32 %start, i32 %limit) {
+; WIDENING_ON-LABEL: @test_02(
+; WIDENING_ON-NEXT:  bb:
+; WIDENING_ON-NEXT:    [[TMP0:%.*]] = zext i32 [[START:%.*]] to i64
+; WIDENING_ON-NEXT:    br label [[LOOP:%.*]]
+; WIDENING_ON:       loop:
+; WIDENING_ON-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV_NEXT:%.*]], [[BACKEDGE:%.*]] ], [ [[TMP0]], [[BB:%.*]] ]
+; WIDENING_ON-NEXT:    [[CANONICAL_IV:%.*]] = phi i32 [ [[CANONICAL_IV_NEXT:%.*]], [[BACKEDGE]] ], [ 0, [[BB]] ]
+; WIDENING_ON-NEXT:    [[EXITCOND:%.*]] = icmp ne i32 [[CANONICAL_IV]], 65635
+; WIDENING_ON-NEXT:    br i1 [[EXITCOND]], label [[CHECKED:%.*]], label [[FAILED:%.*]]
+; WIDENING_ON:       checked:
+; WIDENING_ON-NEXT:    [[TMP1:%.*]] = add nsw i64 [[INDVARS_IV]], -1
+; WIDENING_ON-NEXT:    [[INDVARS_IV_NEXT]] = add nsw i64 [[INDVARS_IV]], -1
+; WIDENING_ON-NEXT:    [[NOT_ZERO:%.*]] = icmp ne i64 [[INDVARS_IV]], 0
+; WIDENING_ON-NEXT:    [[TMP2:%.*]] = zext i32 [[LIMIT:%.*]] to i64
+; WIDENING_ON-NEXT:    [[RANGE_CHECK_WIDE:%.*]] = icmp ult i64 [[TMP1]], [[TMP2]]
+; WIDENING_ON-NEXT:    [[AND:%.*]] = and i1 [[NOT_ZERO]], [[RANGE_CHECK_WIDE]]
+; WIDENING_ON-NEXT:    br i1 [[AND]], label [[BACKEDGE]], label [[EXIT:%.*]]
+; WIDENING_ON:       backedge:
+; WIDENING_ON-NEXT:    [[CANONICAL_IV_NEXT]] = add nuw nsw i32 [[CANONICAL_IV]], 1
+; WIDENING_ON-NEXT:    br label [[LOOP]]
+; WIDENING_ON:       exit:
+; WIDENING_ON-NEXT:    ret i32 0
+; WIDENING_ON:       failed:
+; WIDENING_ON-NEXT:    ret i32 1
+;
+; WIDENING_OFF-LABEL: @test_02(
+; WIDENING_OFF-NEXT:  bb:
+; WIDENING_OFF-NEXT:    br label [[LOOP:%.*]]
+; WIDENING_OFF:       loop:
+; WIDENING_OFF-NEXT:    [[CANONICAL_IV:%.*]] = phi i32 [ [[CANONICAL_IV_NEXT:%.*]], [[BACKEDGE:%.*]] ], [ 0, [[BB:%.*]] ]
+; WIDENING_OFF-NEXT:    [[IV:%.*]] = phi i32 [ [[IV_NEXT:%.*]], [[BACKEDGE]] ], [ [[START:%.*]], [[BB]] ]
+; WIDENING_OFF-NEXT:    [[EXITCOND:%.*]] = icmp ne i32 [[CANONICAL_IV]], 65635
+; WIDENING_OFF-NEXT:    br i1 [[EXITCOND]], label [[CHECKED:%.*]], label [[FAILED:%.*]]
+; WIDENING_OFF:       checked:
+; WIDENING_OFF-NEXT:    [[IV_NEXT]] = add i32 [[IV]], -1
+; WIDENING_OFF-NEXT:    [[NOT_ZERO:%.*]] = icmp ne i32 [[IV]], 0
+; WIDENING_OFF-NEXT:    [[RANGE_CHECK:%.*]] = icmp ult i32 [[IV_NEXT]], [[LIMIT:%.*]]
+; WIDENING_OFF-NEXT:    [[AND:%.*]] = and i1 [[NOT_ZERO]], [[RANGE_CHECK]]
+; WIDENING_OFF-NEXT:    br i1 [[AND]], label [[BACKEDGE]], label [[EXIT:%.*]]
+; WIDENING_OFF:       backedge:
+; WIDENING_OFF-NEXT:    [[ZEXT:%.*]] = zext i32 [[IV_NEXT]] to i64
+; WIDENING_OFF-NEXT:    [[GEP:%.*]] = getelementptr inbounds i32, ptr addrspace(1) poison, i64 [[ZEXT]]
+; WIDENING_OFF-NEXT:    [[CANONICAL_IV_NEXT]] = add nuw nsw i32 [[CANONICAL_IV]], 1
+; WIDENING_OFF-NEXT:    br label [[LOOP]]
+; WIDENING_OFF:       exit:
+; WIDENING_OFF-NEXT:    ret i32 0
+; WIDENING_OFF:       failed:
+; WIDENING_OFF-NEXT:    ret i32 1
+;
+bb:
+  br label %loop
+
+loop:                                              ; preds = %backedge, %bb
+  %canonical_iv = phi i32 [ %canonical_iv.next, %backedge ], [ 0, %bb ]
+  %iv = phi i32 [ %iv.next, %backedge ], [ %start, %bb ]
+  %canonical_iv_check = icmp ult i32 %canonical_iv, 65635
+  br i1 %canonical_iv_check, label %checked, label %failed
+
+checked:
+  %iv.next = add i32 %iv, -1
+  %not.zero = icmp ne i32 %iv, 0
+  %range.check = icmp ult i32 %iv.next, %limit
+  %and = and i1 %not.zero, %range.check
+  br i1 %and, label %backedge, label %exit
+
+backedge:                                              ; preds = %loop
+  %zext = zext i32 %iv.next to i64
+  %gep = getelementptr inbounds i32, ptr addrspace(1) poison, i64 %zext
+  %canonical_iv.next = add i32 %canonical_iv, 1
+  br label %loop
+
+exit:                                             ; preds = %loop
+  ret i32 0
+
+failed:
+  ret i32 1
+}