[llvm] 34637bb - [tests] precommit test for an upcoming change
Philip Reames via llvm-commits
llvm-commits at lists.llvm.org
Tue Mar 9 11:52:14 PST 2021
Author: Philip Reames
Date: 2021-03-09T11:52:07-08:00
New Revision: 34637bbe27d3971025cba02dfd4e52a46024f3d7
URL: https://github.com/llvm/llvm-project/commit/34637bbe27d3971025cba02dfd4e52a46024f3d7
DIFF: https://github.com/llvm/llvm-project/commit/34637bbe27d3971025cba02dfd4e52a46024f3d7.diff
LOG: [tests] precommit test for an upcoming change
Added:
Modified:
llvm/test/CodeGen/X86/usub_inc_iv.ll
Removed:
################################################################################
diff --git a/llvm/test/CodeGen/X86/usub_inc_iv.ll b/llvm/test/CodeGen/X86/usub_inc_iv.ll
index a3097e9314d1..da0fde128890 100644
--- a/llvm/test/CodeGen/X86/usub_inc_iv.ll
+++ b/llvm/test/CodeGen/X86/usub_inc_iv.ll
@@ -306,3 +306,102 @@ exit: ; preds = %loop
failure: ; preds = %backedge
unreachable
}
+
+
+; test_01, but with an additional use of %iv.next outside the loop
+define i32 @test_06(i32* %p, i64 %len, i32 %x) {
+; CHECK-LABEL: @test_06(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: br label [[LOOP:%.*]]
+; CHECK: loop:
+; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ], [ [[LEN:%.*]], [[ENTRY:%.*]] ]
+; CHECK-NEXT: [[COND_1:%.*]] = icmp eq i64 [[IV]], 0
+; CHECK-NEXT: br i1 [[COND_1]], label [[EXIT:%.*]], label [[BACKEDGE]]
+; CHECK: backedge:
+; CHECK-NEXT: [[SUNKADDR:%.*]] = mul i64 [[IV]], 4
+; CHECK-NEXT: [[TMP0:%.*]] = bitcast i32* [[P:%.*]] to i8*
+; CHECK-NEXT: [[SUNKADDR1:%.*]] = getelementptr i8, i8* [[TMP0]], i64 [[SUNKADDR]]
+; CHECK-NEXT: [[SUNKADDR2:%.*]] = getelementptr i8, i8* [[SUNKADDR1]], i64 -4
+; CHECK-NEXT: [[TMP1:%.*]] = bitcast i8* [[SUNKADDR2]] to i32*
+; CHECK-NEXT: [[LOADED:%.*]] = load atomic i32, i32* [[TMP1]] unordered, align 4
+; CHECK-NEXT: [[IV_NEXT]] = add i64 [[IV]], -1
+; CHECK-NEXT: [[COND_2:%.*]] = icmp eq i32 [[LOADED]], [[X:%.*]]
+; CHECK-NEXT: br i1 [[COND_2]], label [[FAILURE:%.*]], label [[LOOP]]
+; CHECK: exit:
+; CHECK-NEXT: ret i32 -1
+; CHECK: failure:
+; CHECK-NEXT: [[TRUNC:%.*]] = trunc i64 [[IV_NEXT]] to i32
+; CHECK-NEXT: ret i32 [[TRUNC]]
+;
+entry:
+ %scevgep = getelementptr i32, i32* %p, i64 -1
+ br label %loop
+
+loop: ; preds = %backedge, %entry
+ %iv = phi i64 [ %iv.next, %backedge ], [ %len, %entry ]
+ %cond_1 = icmp eq i64 %iv, 0
+ br i1 %cond_1, label %exit, label %backedge
+
+backedge: ; preds = %loop
+ %scevgep1 = getelementptr i32, i32* %scevgep, i64 %iv
+ %loaded = load atomic i32, i32* %scevgep1 unordered, align 4
+ %iv.next = add i64 %iv, -1
+ %cond_2 = icmp eq i32 %loaded, %x
+ br i1 %cond_2, label %failure, label %loop
+
+exit:
+ ret i32 -1
+
+failure:
+ %trunc = trunc i64 %iv.next to i32
+ ret i32 %trunc
+}
+
+
+; Extra use outside loop which prevents us moving the increment to the cmp
+define i32 @test_07_neg(i32* %p, i64 %len, i32 %x) {
+; CHECK-LABEL: @test_07_neg(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: br label [[LOOP:%.*]]
+; CHECK: loop:
+; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ], [ [[LEN:%.*]], [[ENTRY:%.*]] ]
+; CHECK-NEXT: [[IV_NEXT]] = add i64 [[IV]], -1
+; CHECK-NEXT: [[SUNKADDR:%.*]] = mul i64 [[IV_NEXT]], 4
+; CHECK-NEXT: [[TMP0:%.*]] = bitcast i32* [[P:%.*]] to i8*
+; CHECK-NEXT: [[SUNKADDR1:%.*]] = getelementptr i8, i8* [[TMP0]], i64 [[SUNKADDR]]
+; CHECK-NEXT: [[TMP1:%.*]] = bitcast i8* [[SUNKADDR1]] to i32*
+; CHECK-NEXT: [[LOADED:%.*]] = load atomic i32, i32* [[TMP1]] unordered, align 4
+; CHECK-NEXT: [[COND_2:%.*]] = icmp eq i32 [[LOADED]], [[X:%.*]]
+; CHECK-NEXT: br i1 [[COND_2]], label [[FAILURE:%.*]], label [[BACKEDGE]]
+; CHECK: backedge:
+; CHECK-NEXT: [[COND_1:%.*]] = icmp eq i64 [[IV]], 0
+; CHECK-NEXT: br i1 [[COND_1]], label [[EXIT:%.*]], label [[LOOP]]
+; CHECK: exit:
+; CHECK-NEXT: ret i32 -1
+; CHECK: failure:
+; CHECK-NEXT: [[TRUNC:%.*]] = trunc i64 [[IV_NEXT]] to i32
+; CHECK-NEXT: ret i32 [[TRUNC]]
+;
+entry:
+ %scevgep = getelementptr i32, i32* %p, i64 -1
+ br label %loop
+
+loop:
+ %iv = phi i64 [ %iv.next, %backedge ], [ %len, %entry ]
+ %iv.next = add i64 %iv, -1
+ %scevgep1 = getelementptr i32, i32* %scevgep, i64 %iv
+ %loaded = load atomic i32, i32* %scevgep1 unordered, align 4
+ %cond_2 = icmp eq i32 %loaded, %x
+ br i1 %cond_2, label %failure, label %backedge
+
+backedge:
+ %cond_1 = icmp eq i64 %iv, 0
+ br i1 %cond_1, label %exit, label %loop
+
+exit:
+ ret i32 -1
+
+failure:
+ %trunc = trunc i64 %iv.next to i32
+ ret i32 %trunc
+}
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