[InstCombine] Revert r238452: Fold IntToPtr and PtrToInt into preceding loads.

According to git bisect, this is the root cause of a miscompile for Regex in
libLLVMSupport. I am still working on reducing a test case.
The actual bug may be elsewhere and this commit just exposed it.

Anyway, at the moment, to reproduce, follow these steps:
1. Build clang and libLTO in release mode.
2. Create a new build directory <stage2> and cd into it.
3. Use clang and libLTO from #1 to build llvm-extract in Release mode + asserts
   using -O2 -flto
4. Run llvm-extract  -ralias '.*bar' -S test/Other/extract-alias.ll

Result:
program doesn't contain global named '.*bar'!

Expected result:
@a0a0bar = alias void ()* @bar
@a0bar = alias void ()* @bar

declare void @bar()

Note: In step #3, if you don't use lto or asserts, the miscompile disappears.
llvm-svn: 259674

1 files changed, 0 insertions, 79 deletions

diff --git a/llvm/test/Transforms/InstCombine/load-bitcast32.ll b/llvm/test/Transforms/InstCombine/load-bitcast32.ll
deleted file mode 100644
index b1c78a8a314..00000000000
--- a/llvm/test/Transforms/InstCombine/load-bitcast32.ll
+++ /dev/null
@@ -1,79 +0,0 @@
-; RUN: opt -instcombine -S < %s | FileCheck %s
-
-target datalayout = "p:32:32:32"
-
-
-define i64* @test1(i8* %x) {
-entry:
-; CHECK-LABEL: @test1(
-; CHECK: load i64, i64*
-; CHECK: ret
-  %a = bitcast i8* %x to i64*
-  %b = load i64, i64* %a
-  %c = inttoptr i64 %b to i64*
-
-  ret i64* %c
-}
-
-define i32* @test2(i8* %x) {
-entry:
-; CHECK-LABEL: @test2(
-; CHECK: load i32*, i32**
-; CHECK: ret
-  %a = bitcast i8* %x to i32*
-  %b = load i32, i32* %a
-  %c = inttoptr i32 %b to i32*
-
-  ret i32* %c
-}
-
-define i64* @test3(i8* %x) {
-entry:
-; CHECK-LABEL: @test3(
-; CHECK: load i64*, i64**
-; CHECK: ret
-  %a = bitcast i8* %x to i32*
-  %b = load i32, i32* %a
-  %c = inttoptr i32 %b to i64*
-
-  ret i64* %c
-}
-
-define i64 @test4(i8* %x) {
-entry:
-; CHECK-LABEL: @test4(
-; CHECK: load i32, i32*
-; CHECK: zext
-; CHECK: ret
-  %a = bitcast i8* %x to i64**
-  %b = load i64*, i64** %a
-  %c = ptrtoint i64* %b to i64
-
-  ret i64 %c
-}
-
-define i32 @test5(i8* %x) {
-entry:
-; CHECK-LABEL: @test5(
-; CHECK: load i32, i32*
-; CHECK: ret
-  %a = bitcast i8* %x to i32**
-  %b = load i32*, i32** %a
-  %c = ptrtoint i32* %b to i32
-
-  ret i32 %c
-}
-
-define i64 @test6(i8* %x) {
-entry:
-; CHECK-LABEL: @test6(
-; CHECK: load i32, i32*
-; CHECK: zext
-; CHECK: ret
-  %a = bitcast i8* %x to i32**
-  %b = load i32*, i32** %a
-  %c = ptrtoint i32* %b to i64
-
-  ret i64 %c
-}
-