1 files changed, 93 insertions, 0 deletions
diff --git a/llvm/test/Transforms/InstCombine/pr25342.ll b/llvm/test/Transforms/InstCombine/pr25342.ll
new file mode 100644
index 00000000000..b9cc3755a20
--- /dev/null
+++ b/llvm/test/Transforms/InstCombine/pr25342.ll
@@ -0,0 +1,93 @@
+; 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
+}