Revert "InstCombine: Improvement to check if signed addition overflows."

This reverts commit r209746.

It looks it is causing a crash while building libcxx. I am trying to get a
reduced testcase.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209762 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 0 insertions, 56 deletions

diff --git a/test/Transforms/InstCombine/AddOverflow.ll b/test/Transforms/InstCombine/AddOverflow.ll
deleted file mode 100644
index 1bbd1fc59a..0000000000
--- a/test/Transforms/InstCombine/AddOverflow.ll
+++ /dev/null
@@ -1,56 +0,0 @@
-; RUN: opt < %s -instcombine -S | FileCheck %s
-
-target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
-target triple = "x86_64-unknown-linux-gnu"
-
-; CHECK-LABEL: @ripple(
-; CHECK: add nsw i16 %tmp1, 1
-define i32 @ripple(i16 signext %x) {
-bb:
-  %tmp = sext i16 %x to i32
-  %tmp1 = and i32 %tmp, -5
-  %tmp2 = trunc i32 %tmp1 to i16
-  %tmp3 = sext i16 %tmp2 to i32
-  %tmp4 = add i32 %tmp3, 1
-  ret i32 %tmp4
-}
-
-; CHECK-LABEL: @ripplenot(
-; CHECK: add i32 %tmp3, 4
-define i32 @ripplenot(i16 signext %x) {
-bb:
-  %tmp = sext i16 %x to i32
-  %tmp1 = and i32 %tmp, -3
-  %tmp2 = trunc i32 %tmp1 to i16
-  %tmp3 = sext i16 %tmp2 to i32
-  %tmp4 = add i32 %tmp3, 4
-  ret i32 %tmp4
-}
-
-; CHECK-LABEL: @oppositesign(
-; CHECK: add nsw i16 %tmp1, 4
-define i32 @oppositesign(i16 signext %x) {
-bb:
-  %tmp = sext i16 %x to i32
-  %tmp1 = or i32 %tmp, 32768
-  %tmp2 = trunc i32 %tmp1 to i16
-  %tmp3 = sext i16 %tmp2 to i32
-  %tmp4 = add i32 %tmp3, 4
-  ret i32 %tmp4
-}
-
-; CHECK-LABEL: @ripplenot_var(
-; CHECK: add i32 %tmp6, %tmp7
-define i32 @ripplenot_var(i16 signext %x, i16 signext %y) {
-bb:
-  %tmp = sext i16 %x to i32
-  %tmp1 = and i32 %tmp, -5
-  %tmp2 = trunc i32 %tmp1 to i16
-  %tmp3 = sext i16 %y to i32
-  %tmp4 = or i32 %tmp3, 2
-  %tmp5 = trunc i32 %tmp4 to i16
-  %tmp6 = sext i16 %tmp5 to i32
-  %tmp7 = sext i16 %tmp2 to i32
-  %tmp8 = add i32 %tmp6, %tmp7
-  ret i32 %tmp8
-}