revert r311333: [LibCallSimplifier] try harder to fold memcmp with constant arguments

We're getting lots of compile-timeout bot failures like:
http://lab.llvm.org:8011/builders/clang-native-arm-lnt/builds/7119
http://lab.llvm.org:8011/builders/clang-cmake-x86_64-avx2-linux

llvm-svn: 311340

1 files changed, 0 insertions, 65 deletions

diff --git a/llvm/test/Transforms/InstCombine/memcmp-constant-fold.ll b/llvm/test/Transforms/InstCombine/memcmp-constant-fold.ll
deleted file mode 100644
index 84ad96161f4..00000000000
--- a/llvm/test/Transforms/InstCombine/memcmp-constant-fold.ll
+++ /dev/null
@@ -1,65 +0,0 @@
-; RUN: opt < %s -instcombine -S -data-layout=e-n32 | FileCheck %s --check-prefix=ALL --check-prefix=LE
-; RUN: opt < %s -instcombine -S -data-layout=E-n32 | FileCheck %s --check-prefix=ALL --check-prefix=BE
-
-declare i32 @memcmp(i8*, i8*, i64)
-
-; The alignment of this constant does not matter. We constant fold the load.
-
-@charbuf = private unnamed_addr constant [4 x i8] [i8 0, i8 0, i8 0, i8 1], align 1
-
-define i1 @memcmp_4bytes_unaligned_constant_i8(i8* align 4 %x) {
-; LE-LABEL: @memcmp_4bytes_unaligned_constant_i8(
-; LE-NEXT:    [[TMP1:%.*]] = bitcast i8* %x to i32*
-; LE-NEXT:    [[LHSV:%.*]] = load i32, i32* [[TMP1]], align 4
-; LE-NEXT:    [[TMP2:%.*]] = icmp eq i32 [[LHSV]], 16777216
-; LE-NEXT:    ret i1 [[TMP2]]
-;
-; BE-LABEL: @memcmp_4bytes_unaligned_constant_i8(
-; BE-NEXT:    [[TMP1:%.*]] = bitcast i8* %x to i32*
-; BE-NEXT:    [[LHSV:%.*]] = load i32, i32* [[TMP1]], align 4
-; BE-NEXT:    [[TMP2:%.*]] = icmp eq i32 [[LHSV]], 1
-; BE-NEXT:    ret i1 [[TMP2]]
-;
-  %call = tail call i32 @memcmp(i8* %x, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @charbuf, i64 0, i64 0), i64 4)
-  %cmpeq0 = icmp eq i32 %call, 0
-  ret i1 %cmpeq0
-}
-
-; We still don't care about alignment of the constant. We are not limited to constant folding only i8 arrays.
-; It doesn't matter if the constant operand is the first operand to the memcmp.
-
-@intbuf_unaligned = private unnamed_addr constant [4 x i16] [i16 1, i16 2, i16 3, i16 4], align 1
-
-define i1 @memcmp_4bytes_unaligned_constant_i16(i8* align 4 %x) {
-; LE-LABEL: @memcmp_4bytes_unaligned_constant_i16(
-; LE-NEXT:    [[TMP1:%.*]] = bitcast i8* %x to i32*
-; LE-NEXT:    [[RHSV:%.*]] = load i32, i32* [[TMP1]], align 4
-; LE-NEXT:    [[TMP2:%.*]] = icmp eq i32 [[RHSV]], 131073
-; LE-NEXT:    ret i1 [[TMP2]]
-;
-; BE-LABEL: @memcmp_4bytes_unaligned_constant_i16(
-; BE-NEXT:    [[TMP1:%.*]] = bitcast i8* %x to i32*
-; BE-NEXT:    [[RHSV:%.*]] = load i32, i32* [[TMP1]], align 4
-; BE-NEXT:    [[TMP2:%.*]] = icmp eq i32 [[RHSV]], 65538
-; BE-NEXT:    ret i1 [[TMP2]]
-;
-  %call = tail call i32 @memcmp(i8* bitcast (i16* getelementptr inbounds ([4 x i16], [4 x i16]* @intbuf_unaligned, i64 0, i64 0) to i8*), i8* %x, i64 4)
-  %cmpeq0 = icmp eq i32 %call, 0
-  ret i1 %cmpeq0
-}
-
-; TODO: Any memcmp where all arguments are constants should be constant folded. Currently, we only handle i8 array constants.
-
-@intbuf = private unnamed_addr constant [2 x i32] [i32 0, i32 1], align 4
-
-define i1 @memcmp_3bytes_aligned_constant_i32(i8* align 4 %x) {
-; ALL-LABEL: @memcmp_3bytes_aligned_constant_i32(
-; ALL-NEXT:    [[CALL:%.*]] = tail call i32 @memcmp(i8* bitcast (i32* getelementptr inbounds ([2 x i32], [2 x i32]* @intbuf, i64 0, i64 1) to i8*), i8* bitcast ([2 x i32]* @intbuf to i8*), i64 3)
-; ALL-NEXT:    [[CMPEQ0:%.*]] = icmp eq i32 [[CALL]], 0
-; ALL-NEXT:    ret i1 [[CMPEQ0]]
-;
-  %call = tail call i32 @memcmp(i8* bitcast (i32* getelementptr inbounds ([2 x i32], [2 x i32]* @intbuf, i64 0, i64 1) to i8*), i8* bitcast (i32* getelementptr inbounds ([2 x i32], [2 x i32]* @intbuf, i64 0, i64 0) to i8*), i64 3)
-  %cmpeq0 = icmp eq i32 %call, 0
-  ret i1 %cmpeq0
-}
-