Revert "[InstCombine] Avoid combining the bitcast of a var that is used as both address and result of load instructions"

Revert "[InstCombine] Combine A->B->A BitCast"

as this appears to cause PR27996 and as discussed in http://reviews.llvm.org/D20847

This reverts commits r270135 and r263734.

llvm-svn: 274094

2 files changed, 0 insertions, 113 deletions

diff --git a/llvm/test/Transforms/InstCombine/pr25342.ll b/llvm/test/Transforms/InstCombine/pr25342.ll
deleted file mode 100644
index b9cc3755a20..00000000000
--- a/llvm/test/Transforms/InstCombine/pr25342.ll
+++ /dev/null
@@ -1,93 +0,0 @@
-; RUN: opt < %s -instcombine -S | FileCheck %s
-
-%"struct.std::complex" = type { { float, float } }
-@dd = external global %"struct.std::complex", align 4
-@dd2 = external global %"struct.std::complex", align 4
-
-define void @_Z3fooi(i32 signext %n) {
-entry:
-  br label %for.cond
-
-for.cond:
-  %ldd.sroa.0.0 = phi i32 [ 0, %entry ], [ %5, %for.body ]
-  %ldd.sroa.6.0 = phi i32 [ 0, %entry ], [ %7, %for.body ]
-  %i.0 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
-  %cmp = icmp slt i32 %i.0, %n
-  br i1 %cmp, label %for.body, label %for.end
-
-for.body:
-  %0 = load float, float* getelementptr inbounds (%"struct.std::complex", %"struct.std::complex"* @dd, i64 0, i32 0, i32 0), align 4
-  %1 = load float, float* getelementptr inbounds (%"struct.std::complex", %"struct.std::complex"* @dd, i64 0, i32 0, i32 1), align 4
-  %2 = load float, float* getelementptr inbounds (%"struct.std::complex", %"struct.std::complex"* @dd2, i64 0, i32 0, i32 0), align 4
-  %3 = load float, float* getelementptr inbounds (%"struct.std::complex", %"struct.std::complex"* @dd2, i64 0, i32 0, i32 1), align 4
-  %mul.i = fmul float %0, %2
-  %mul4.i = fmul float %1, %3
-  %sub.i = fsub float %mul.i, %mul4.i
-  %mul5.i = fmul float %1, %2
-  %mul6.i = fmul float %0, %3
-  %add.i4 = fadd float %mul5.i, %mul6.i
-  %4 = bitcast i32 %ldd.sroa.0.0 to float
-  %add.i = fadd float %sub.i, %4
-  %5 = bitcast float %add.i to i32
-  %6 = bitcast i32 %ldd.sroa.6.0 to float
-  %add4.i = fadd float %add.i4, %6
-  %7 = bitcast float %add4.i to i32
-  %inc = add nsw i32 %i.0, 1
-  br label %for.cond
-
-for.end:
-  store i32 %ldd.sroa.0.0, i32* bitcast (%"struct.std::complex"* @dd to i32*), align 4
-  store i32 %ldd.sroa.6.0, i32* bitcast (float* getelementptr inbounds (%"struct.std::complex", %"struct.std::complex"* @dd, i64 0, i32 0, i32 1) to i32*), align 4
-  ret void
-
-; CHECK: phi float
-; CHECK: store float
-; CHECK-NOT: bitcast
-}
-
-
-define void @multi_phi(i32 signext %n) {
-entry:
-  br label %for.cond
-
-for.cond:
-  %ldd.sroa.0.0 = phi i32 [ 0, %entry ], [ %9, %odd.bb ]
-  %i.0 = phi i32 [ 0, %entry ], [ %inc, %odd.bb ]
-  %cmp = icmp slt i32 %i.0, %n
-  br i1 %cmp, label %for.body, label %for.end
-
-for.body:
-  %0 = load float, float* getelementptr inbounds (%"struct.std::complex", %"struct.std::complex"* @dd, i64 0, i32 0, i32 0), align 4
-  %1 = load float, float* getelementptr inbounds (%"struct.std::complex", %"struct.std::complex"* @dd, i64 0, i32 0, i32 1), align 4
-  %2 = load float, float* getelementptr inbounds (%"struct.std::complex", %"struct.std::complex"* @dd2, i64 0, i32 0, i32 0), align 4
-  %3 = load float, float* getelementptr inbounds (%"struct.std::complex", %"struct.std::complex"* @dd2, i64 0, i32 0, i32 1), align 4
-  %mul.i = fmul float %0, %2
-  %mul4.i = fmul float %1, %3
-  %sub.i = fsub float %mul.i, %mul4.i
-  %4 = bitcast i32 %ldd.sroa.0.0 to float
-  %add.i = fadd float %sub.i, %4
-  %5 = bitcast float %add.i to i32
-  %inc = add nsw i32 %i.0, 1
-  %bit0 = and i32 %inc, 1
-  %even = icmp slt i32 %bit0, 1
-  br i1 %even, label %even.bb, label %odd.bb
-
-even.bb:
-  %6 = bitcast i32 %5 to float
-  %7 = fadd float %sub.i, %6
-  %8 = bitcast float %7 to i32
-  br label %odd.bb
-
-odd.bb:
-  %9 = phi i32 [ %5, %for.body ], [ %8, %even.bb ]
-  br label %for.cond
-
-for.end:
-  store i32 %ldd.sroa.0.0, i32* bitcast (%"struct.std::complex"* @dd to i32*), align 4
-  ret void
-
-; CHECK-LABEL: @multi_phi(
-; CHECK: phi float
-; CHECK: store float
-; CHECK-NOT: bitcast
-}
diff --git a/llvm/test/Transforms/InstCombine/pr27703.ll b/llvm/test/Transforms/InstCombine/pr27703.ll
deleted file mode 100644
index 2981afe171e..00000000000
--- a/llvm/test/Transforms/InstCombine/pr27703.ll
+++ /dev/null
@@ -1,20 +0,0 @@
-; RUN: opt < %s -instcombine -S | FileCheck %s
-
-define void @mem() {
-bb:
-  br label %bb6
-
-bb6:
-  %.0 = phi i8** [ undef, %bb ], [ %t2, %bb6 ]
-  %tmp = load i8*, i8** %.0, align 8
-  %bc = bitcast i8* %tmp to i8**
-  %t1 = load i8*, i8** %bc, align 8
-  %t2 = bitcast i8* %t1 to i8**
-  br label %bb6
-
-bb206:
-  ret void
-; CHECK: phi
-; CHECK: bitcast
-; CHECK: load
-}