From 4b88702ac3fac540b970e2d92f3dcc5071f16a84 Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Tue, 9 Sep 2008 23:02:14 +0000
Subject: [PATCH] Legalizer was missing code that expand fpow to a libcall.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56028 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/SelectionDAG/LegalizeDAG.cpp | 22 ++++++++++++----------
 test/CodeGen/ARM/fpow.ll                 | 10 ++++++++++
 2 files changed, 22 insertions(+), 10 deletions(-)
 create mode 100644 test/CodeGen/ARM/fpow.ll

diff --git a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
index 1155addfe5f..86ae4088bb7 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -6602,13 +6602,9 @@ void SelectionDAGLegalize::ExpandOp(SDValue Op, SDValue &Lo, SDValue &Hi){
     Lo = ExpandLibCall(LC, Node, true, Hi);
     break;
   }
-  case ISD::FPOWI:
-    Lo = ExpandLibCall(GetFPLibCall(VT, RTLIB::POWI_F32,
-                                        RTLIB::POWI_F64,
-                                        RTLIB::POWI_F80,
-                                        RTLIB::POWI_PPCF128),
-                       Node, false, Hi);
-    break;
+  case ISD::FSQRT:
+  case ISD::FSIN:
+  case ISD::FCOS: 
   case ISD::FLOG:
   case ISD::FLOG2:
   case ISD::FLOG10:
@@ -6619,9 +6615,7 @@ void SelectionDAGLegalize::ExpandOp(SDValue Op, SDValue &Lo, SDValue &Hi){
   case ISD::FCEIL:
   case ISD::FRINT:
   case ISD::FNEARBYINT:
-  case ISD::FSQRT:
-  case ISD::FSIN:
-  case ISD::FCOS: {
+  case ISD::FPOW: {
     RTLIB::Libcall LC = RTLIB::UNKNOWN_LIBCALL;
     switch(Node->getOpcode()) {
     case ISD::FSQRT:
@@ -6676,6 +6670,14 @@ void SelectionDAGLegalize::ExpandOp(SDValue Op, SDValue &Lo, SDValue &Hi){
       LC = GetFPLibCall(VT, RTLIB::NEARBYINT_F32, RTLIB::NEARBYINT_F64,
                         RTLIB::NEARBYINT_F80, RTLIB::NEARBYINT_PPCF128);
       break;
+    case ISD::FPOW:
+      LC = GetFPLibCall(VT, RTLIB::POW_F32, RTLIB::POW_F64, RTLIB::POW_F80,
+                        RTLIB::POW_PPCF128);
+      break;
+    case ISD::FPOWI:
+      LC = GetFPLibCall(VT, RTLIB::POWI_F32, RTLIB::POWI_F64, RTLIB::POWI_F80,
+                        RTLIB::POWI_PPCF128);
+      break;
     default: assert(0 && "Unreachable!");
     }
     Lo = ExpandLibCall(LC, Node, false, Hi);
diff --git a/test/CodeGen/ARM/fpow.ll b/test/CodeGen/ARM/fpow.ll
new file mode 100644
index 00000000000..02a895bf96c
--- /dev/null
+++ b/test/CodeGen/ARM/fpow.ll
@@ -0,0 +1,10 @@
+; RUN: llvm-as < %s | llc -march=arm
+; RUN: llvm-as < %s | llc -march=thumb
+
+define double @t(double %x, double %y) nounwind notes(opt_size) {
+entry:
+	%0 = tail call double @llvm.pow.f64( double %x, double %y )		; <double> [#uses=1]
+	ret double %0
+}
+
+declare double @llvm.pow.f64(double, double) nounwind readonly