diff options
Diffstat (limited to 'test/CodeGen/X86/MergeConsecutiveStores.ll')
-rw-r--r-- | test/CodeGen/X86/MergeConsecutiveStores.ll | 96 |
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 +} |