[PowerPC] Fix the int2fp(fp2int(x)) DAGCombine to ignore ppc_fp128

This DAGCombine was creating custom SDAG nodes with an illegal ppc_fp128
operand type because it was triggering on f64/f32 int2fp(fp2int(ppc_fp128 x)),
but shouldn't (it should only apply to f32/f64 types). The result was a crash.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@245530 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/PowerPC/PPCISelLowering.cpp b/lib/Target/PowerPC/PPCISelLowering.cpp
index 173269c7395d1813e2e0041036842e366941bbab..72d1d19d0f3371ccbeaf8266d240de78ac94832b 100644 (file)
--- a/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -9991,6 +9991,9 @@ SDValue PPCTargetLowering::combineFPToIntToFP(SDNode *N,
     if (Src.getValueType() == MVT::f32) {
       Src = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, Src);
       DCI.AddToWorklist(Src.getNode());
+    } else if (Src.getValueType() != MVT::f64) {
+      // Make sure that we don't pick up a ppc_fp128 source value.
+      return SDValue();
     }
 
     unsigned FCTOp =

diff --git a/test/CodeGen/PowerPC/fp2int2fp-ppcfp128.ll b/test/CodeGen/PowerPC/fp2int2fp-ppcfp128.ll
new file mode 100644 (file)
index 0000000..7742ffe
--- /dev/null
+++ b/test/CodeGen/PowerPC/fp2int2fp-ppcfp128.ll
@@ -0,0 +1,16 @@
+; RUN: llc -mcpu=a2 < %s | FileCheck %s
+target datalayout = "E-m:e-i64:64-n32:64"
+target triple = "powerpc64-bgq-linux"
+
+define linkonce_odr double @test1() {
+entry:
+  %conv6.i.i = fptosi ppc_fp128 undef to i64
+  %conv.i = sitofp i64 %conv6.i.i to double
+  ret double %conv.i
+
+; CHECK-LABEL: @test1
+; CHECK: bl __fixtfdi
+; CHECK: fcfid
+; CHECK: blr
+}
+