[ARM] GlobalISel: Lower single precision FP args

Both for aapcscc and aapcs_vfpcc. We currently filter out soft float targets
because we don't support libcalls yet.

llvm-svn: 294584

llvm/lib/Target/ARM/ARMCallLowering.cpp

@@ -35,7 +35,7 @@ ARMCallLowering::ARMCallLowering(const ARMTargetLowering &TLI)
 static bool isSupportedType(const DataLayout &DL, const ARMTargetLowering &TLI,
                             Type *T) {
   EVT VT = TLI.getValueType(DL, T, true);
-  if (!VT.isSimple() || !VT.isInteger() || VT.isVector())
+  if (!VT.isSimple() || VT.isVector())
     return false;
 
   unsigned VTSize = VT.getSimpleVT().getSizeInBits();
@@ -205,7 +205,13 @@ bool ARMCallLowering::lowerFormalArguments(MachineIRBuilder &MIRBuilder,
   auto DL = MF.getDataLayout();
   auto &TLI = *getTLI<ARMTargetLowering>();
 
-  if (TLI.getSubtarget()->isThumb())
+  auto Subtarget = TLI.getSubtarget();
+
+  if (Subtarget->isThumb())
+    return false;
+
+  // FIXME: Support soft float (when we're ready to generate libcalls)
+  if (Subtarget->useSoftFloat() || !Subtarget->hasVFP2())
     return false;
 
   auto &Args = F.getArgumentList();

llvm/test/CodeGen/ARM/GlobalISel/arm-irtranslator.ll

@@ -1,4 +1,4 @@
-; RUN: llc -mtriple arm-unknown -global-isel -stop-after=irtranslator %s -o - | FileCheck %s
+; RUN: llc -mtriple arm-unknown -mattr=+vfp2 -global-isel -stop-after=irtranslator %s -o - | FileCheck %s
 
 define void @test_void_return() {
 ; CHECK-LABEL: name: test_void_return
@@ -172,3 +172,51 @@ entry:
   %v = load i32, i32* %p
   ret i32 %v
 }
+
+define arm_aapcscc float @test_float_aapcscc(float %p0, float %p1, float %p2,
+                                             float %p3, float %p4, float %p5) {
+; CHECK-LABEL: name: test_float_aapcscc
+; CHECK: fixedStack:
+; CHECK-DAG: id: [[P4:[0-9]+]]{{.*}}offset: 0{{.*}}size: 4
+; CHECK-DAG: id: [[P5:[0-9]+]]{{.*}}offset: 4{{.*}}size: 4
+; CHECK: liveins: %r0, %r1, %r2, %r3
+; CHECK: [[VREGP1:%[0-9]+]](s32) = COPY %r1
+; CHECK: [[FIP5:%[0-9]+]](p0) = G_FRAME_INDEX %fixed-stack.[[P5]]
+; CHECK: [[VREGP5:%[0-9]+]](s32) = G_LOAD [[FIP5]](p0)
+; CHECK: [[VREGV:%[0-9]+]](s32) = G_FADD [[VREGP1]], [[VREGP5]]
+; CHECK: %r0 = COPY [[VREGV]]
+; CHECK: BX_RET 14, _, implicit %r0
+entry:
+  %v = fadd float %p1, %p5
+  ret float %v
+}
+
+define arm_aapcs_vfpcc float @test_float_vfpcc(float %p0, float %p1, float %p2,
+                                               float %p3, float %p4, float %p5,
+                                               float %ridiculous,
+                                               float %number,
+                                               float %of,
+                                               float %parameters,
+                                               float %that,
+                                               float %should,
+                                               float %never,
+                                               float %exist,
+                                               float %in,
+                                               float %practice,
+                                               float %q0, float %q1) {
+; CHECK-LABEL: name: test_float_vfpcc
+; CHECK: fixedStack:
+; CHECK-DAG: id: [[Q0:[0-9]+]]{{.*}}offset: 0{{.*}}size: 4
+; CHECK-DAG: id: [[Q1:[0-9]+]]{{.*}}offset: 4{{.*}}size: 4
+; CHECK: liveins: %s0, %s1, %s2, %s3, %s4, %s5, %s6, %s7, %s8, %s9, %s10, %s11, %s12, %s13, %s14, %s15
+; CHECK: [[VREGP1:%[0-9]+]](s32) = COPY %s1
+; CHECK: [[FIQ1:%[0-9]+]](p0) = G_FRAME_INDEX %fixed-stack.[[Q1]]
+; CHECK: [[VREGQ1:%[0-9]+]](s32) = G_LOAD [[FIQ1]](p0)
+; CHECK: [[VREGV:%[0-9]+]](s32) = G_FADD [[VREGP1]], [[VREGQ1]]
+; CHECK: %s0 = COPY [[VREGV]]
+; CHECK: BX_RET 14, _, implicit %s0
+entry:
+  %v = fadd float %p1, %q1
+  ret float %v
+}
+

llvm/test/CodeGen/ARM/GlobalISel/arm-isel.ll

@@ -1,4 +1,4 @@
-; RUN: llc -mtriple arm-unknown -global-isel %s -o - | FileCheck %s
+; RUN: llc -mtriple arm-unknown -mattr=+vfp2 -global-isel %s -o - | FileCheck %s
 
 define void @test_void_return() {
 ; CHECK-LABEL: test_void_return:
@@ -139,3 +139,24 @@ entry:
   %v = load i8*, i8** %p
   ret i8* %v
 }
+
+define arm_aapcs_vfpcc float @test_float_hard(float %f0, float %f1) {
+; CHECK-LABEL: test_float_hard:
+; CHECK: vadd.f32 s0, s0, s1
+; CHECK: bx lr
+entry:
+  %v = fadd float %f0, %f1
+  ret float %v
+}
+
+define arm_aapcscc float @test_float_softfp(float %f0, float %f1) {
+; CHECK-LABEL: test_float_softfp:
+; CHECK-DAG: vmov [[F0:s[0-9]+]], r0
+; CHECK-DAG: vmov [[F1:s[0-9]+]], r1
+; CHECK: vadd.f32 [[FV:s[0-9]+]], [[F0]], [[F1]]
+; CHECK: vmov r0, [[FV]]
+; CHECK: bx lr
+entry:
+  %v = fadd float %f0, %f1
+  ret float %v
+}