[ARM] GlobalISel: Support frem for 32-bit values

Legalize to a libcall.
On this occasion, also start allowing soft float subtargets. For the
moment G_FREM is the only legal floating point operation for them.

llvm-svn: 299753

2 files changed, 3 insertions, 5 deletions

diff --git a/llvm/lib/Target/ARM/ARMCallLowering.cpp b/llvm/lib/Target/ARM/ARMCallLowering.cpp
index 10e144f8900..94b317a8f98 100644
--- a/llvm/lib/Target/ARM/ARMCallLowering.cpp
+++ b/llvm/lib/Target/ARM/ARMCallLowering.cpp
@@ -333,10 +333,6 @@ bool ARMCallLowering::lowerFormalArguments(MachineIRBuilder &MIRBuilder,
   if (Subtarget->isThumb())
     return false;
 
-  // FIXME: Support soft float (when we're ready to generate libcalls)
-  if (Subtarget->useSoftFloat() || !Subtarget->hasVFP2())
-    return false;
-
   for (auto &Arg : F.args())
     if (!isSupportedType(DL, TLI, Arg.getType()))
       return false;
diff --git a/llvm/lib/Target/ARM/ARMLegalizerInfo.cpp b/llvm/lib/Target/ARM/ARMLegalizerInfo.cpp
index cc30547a7b4..64cca82f13e 100644
--- a/llvm/lib/Target/ARM/ARMLegalizerInfo.cpp
+++ b/llvm/lib/Target/ARM/ARMLegalizerInfo.cpp
@@ -57,7 +57,7 @@ ARMLegalizerInfo::ARMLegalizerInfo(const ARMSubtarget &ST) {
 
   setAction({G_CONSTANT, s32}, Legal);
 
-  if (ST.hasVFP2()) {
+  if (!ST.useSoftFloat() && ST.hasVFP2()) {
     setAction({G_FADD, s32}, Legal);
     setAction({G_FADD, s64}, Legal);
 
@@ -65,5 +65,7 @@ ARMLegalizerInfo::ARMLegalizerInfo(const ARMSubtarget &ST) {
     setAction({G_STORE, s64}, Legal);
   }
 
+  setAction({G_FREM, s32}, Libcall);
+
   computeTables();
 }