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-rw-r--r--test/CodeGen/X86/MergeConsecutiveStores.ll96
1 files changed, 96 insertions, 0 deletions
diff --git a/test/CodeGen/X86/MergeConsecutiveStores.ll b/test/CodeGen/X86/MergeConsecutiveStores.ll
index fbe8879ad6..bb227a0185 100644
--- a/test/CodeGen/X86/MergeConsecutiveStores.ll
+++ b/test/CodeGen/X86/MergeConsecutiveStores.ll
@@ -337,3 +337,99 @@ block4: ; preds = %4, %.lr.ph
ret void
}
+; Make sure that we merge the consecutive load/store sequence below and use a
+; word (16 bit) instead of a byte copy.
+; CHECK: MergeLoadStoreBaseIndexOffset
+; CHECK: movw (%{{.*}},%{{.*}}), [[REG:%[a-z]+]]
+; CHECK: movw [[REG]], (%{{.*}})
+define void @MergeLoadStoreBaseIndexOffset(i64* %a, i8* %b, i8* %c, i32 %n) {
+ br label %1
+
+; <label>:1
+ %.09 = phi i32 [ %n, %0 ], [ %11, %1 ]
+ %.08 = phi i8* [ %b, %0 ], [ %10, %1 ]
+ %.0 = phi i64* [ %a, %0 ], [ %2, %1 ]
+ %2 = getelementptr inbounds i64* %.0, i64 1
+ %3 = load i64* %.0, align 1
+ %4 = getelementptr inbounds i8* %c, i64 %3
+ %5 = load i8* %4, align 1
+ %6 = add i64 %3, 1
+ %7 = getelementptr inbounds i8* %c, i64 %6
+ %8 = load i8* %7, align 1
+ store i8 %5, i8* %.08, align 1
+ %9 = getelementptr inbounds i8* %.08, i64 1
+ store i8 %8, i8* %9, align 1
+ %10 = getelementptr inbounds i8* %.08, i64 2
+ %11 = add nsw i32 %.09, -1
+ %12 = icmp eq i32 %11, 0
+ br i1 %12, label %13, label %1
+
+; <label>:13
+ ret void
+}
+
+; Make sure that we merge the consecutive load/store sequence below and use a
+; word (16 bit) instead of a byte copy even if there are intermediate sign
+; extensions.
+; CHECK: MergeLoadStoreBaseIndexOffsetSext
+; CHECK: movw (%{{.*}},%{{.*}}), [[REG:%[a-z]+]]
+; CHECK: movw [[REG]], (%{{.*}})
+define void @MergeLoadStoreBaseIndexOffsetSext(i8* %a, i8* %b, i8* %c, i32 %n) {
+ br label %1
+
+; <label>:1
+ %.09 = phi i32 [ %n, %0 ], [ %12, %1 ]
+ %.08 = phi i8* [ %b, %0 ], [ %11, %1 ]
+ %.0 = phi i8* [ %a, %0 ], [ %2, %1 ]
+ %2 = getelementptr inbounds i8* %.0, i64 1
+ %3 = load i8* %.0, align 1
+ %4 = sext i8 %3 to i64
+ %5 = getelementptr inbounds i8* %c, i64 %4
+ %6 = load i8* %5, align 1
+ %7 = add i64 %4, 1
+ %8 = getelementptr inbounds i8* %c, i64 %7
+ %9 = load i8* %8, align 1
+ store i8 %6, i8* %.08, align 1
+ %10 = getelementptr inbounds i8* %.08, i64 1
+ store i8 %9, i8* %10, align 1
+ %11 = getelementptr inbounds i8* %.08, i64 2
+ %12 = add nsw i32 %.09, -1
+ %13 = icmp eq i32 %12, 0
+ br i1 %13, label %14, label %1
+
+; <label>:14
+ ret void
+}
+
+; However, we can only merge ignore sign extensions when they are on all memory
+; computations;
+; CHECK: loadStoreBaseIndexOffsetSextNoSex
+; CHECK-NOT: movw (%{{.*}},%{{.*}}), [[REG:%[a-z]+]]
+; CHECK-NOT: movw [[REG]], (%{{.*}})
+define void @loadStoreBaseIndexOffsetSextNoSex(i8* %a, i8* %b, i8* %c, i32 %n) {
+ br label %1
+
+; <label>:1
+ %.09 = phi i32 [ %n, %0 ], [ %12, %1 ]
+ %.08 = phi i8* [ %b, %0 ], [ %11, %1 ]
+ %.0 = phi i8* [ %a, %0 ], [ %2, %1 ]
+ %2 = getelementptr inbounds i8* %.0, i64 1
+ %3 = load i8* %.0, align 1
+ %4 = sext i8 %3 to i64
+ %5 = getelementptr inbounds i8* %c, i64 %4
+ %6 = load i8* %5, align 1
+ %7 = add i8 %3, 1
+ %wrap.4 = sext i8 %7 to i64
+ %8 = getelementptr inbounds i8* %c, i64 %wrap.4
+ %9 = load i8* %8, align 1
+ store i8 %6, i8* %.08, align 1
+ %10 = getelementptr inbounds i8* %.08, i64 1
+ store i8 %9, i8* %10, align 1
+ %11 = getelementptr inbounds i8* %.08, i64 2
+ %12 = add nsw i32 %.09, -1
+ %13 = icmp eq i32 %12, 0
+ br i1 %13, label %14, label %1
+
+; <label>:14
+ ret void
+}