From 36b7beb42921c428fc9f5b5a9cc9feb7fe7dd4b3 Mon Sep 17 00:00:00 2001
From: Chad Rosier <mcrosier@apple.com>
Date: Fri, 3 Feb 2012 19:42:52 +0000
Subject: [PATCH] [fast-isel] Add support for selecting UIToFP.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149704 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/ARMFastISel.cpp           | 14 ++--
 test/CodeGen/ARM/fast-isel-conversion.ll | 94 ++++++++++++++++++++++++
 2 files changed, 102 insertions(+), 6 deletions(-)

diff --git a/lib/Target/ARM/ARMFastISel.cpp b/lib/Target/ARM/ARMFastISel.cpp
index e8ba801d846..48cd5f4b574 100644
--- a/lib/Target/ARM/ARMFastISel.cpp
+++ b/lib/Target/ARM/ARMFastISel.cpp
@@ -161,7 +161,7 @@ class ARMFastISel : public FastISel {
     bool SelectFPExt(const Instruction *I);
     bool SelectFPTrunc(const Instruction *I);
     bool SelectBinaryOp(const Instruction *I, unsigned ISDOpcode);
-    bool SelectSIToFP(const Instruction *I);
+    bool SelectIToFP(const Instruction *I, bool isZExt);
     bool SelectFPToSI(const Instruction *I);
     bool SelectSDiv(const Instruction *I);
     bool SelectSRem(const Instruction *I);
@@ -1535,7 +1535,7 @@ bool ARMFastISel::SelectFPTrunc(const Instruction *I) {
   return true;
 }
 
-bool ARMFastISel::SelectSIToFP(const Instruction *I) {
+bool ARMFastISel::SelectIToFP(const Instruction *I, bool isZExt) {
   // Make sure we have VFP.
   if (!Subtarget->hasVFP2()) return false;
 
@@ -1555,7 +1555,7 @@ bool ARMFastISel::SelectSIToFP(const Instruction *I) {
   // Handle sign-extension.
   if (SrcVT == MVT::i16 || SrcVT == MVT::i8) {
     EVT DestVT = MVT::i32;
-    unsigned ResultReg = ARMEmitIntExt(SrcVT, SrcReg, DestVT, /*isZExt*/ false);
+    unsigned ResultReg = ARMEmitIntExt(SrcVT, SrcReg, DestVT, isZExt);
     if (ResultReg == 0) return false;
     SrcReg = ResultReg;
   }
@@ -1566,8 +1566,8 @@ bool ARMFastISel::SelectSIToFP(const Instruction *I) {
   if (FP == 0) return false;
 
   unsigned Opc;
-  if (Ty->isFloatTy()) Opc = ARM::VSITOS;
-  else if (Ty->isDoubleTy()) Opc = ARM::VSITOD;
+  if (Ty->isFloatTy()) Opc = isZExt ? ARM::VUITOS : ARM::VSITOS;
+  else if (Ty->isDoubleTy()) Opc = isZExt ? ARM::VUITOD : ARM::VSITOD;
   else return false;
 
   unsigned ResultReg = createResultReg(TLI.getRegClassFor(DstVT));
@@ -2449,7 +2449,9 @@ bool ARMFastISel::TargetSelectInstruction(const Instruction *I) {
     case Instruction::FPTrunc:
       return SelectFPTrunc(I);
     case Instruction::SIToFP:
-      return SelectSIToFP(I);
+      return SelectIToFP(I, /*isZExt*/ false);
+    case Instruction::UIToFP:
+      return SelectIToFP(I, /*isZExt*/ true);
     case Instruction::FPToSI:
       return SelectFPToSI(I);
     case Instruction::FAdd:
diff --git a/test/CodeGen/ARM/fast-isel-conversion.ll b/test/CodeGen/ARM/fast-isel-conversion.ll
index f00762585d0..f33c98d7dfc 100644
--- a/test/CodeGen/ARM/fast-isel-conversion.ll
+++ b/test/CodeGen/ARM/fast-isel-conversion.ll
@@ -94,3 +94,97 @@ entry:
   store double %conv, double* %b.addr, align 8
   ret void
 }
+
+; Test uitofp
+
+define void @uitofp_single_i32(i32 %a, float %b) nounwind ssp {
+entry:
+; ARM: uitofp_single_i32
+; ARM: vmov s0, r0
+; ARM: vcvt.f32.u32 s0, s0
+; THUMB: uitofp_single_i32
+; THUMB: vmov s0, r0
+; THUMB: vcvt.f32.u32 s0, s0
+  %b.addr = alloca float, align 4
+  %conv = uitofp i32 %a to float
+  store float %conv, float* %b.addr, align 4
+  ret void
+}
+
+define void @uitofp_single_i16(i16 %a, float %b) nounwind ssp {
+entry:
+; ARM: uitofp_single_i16
+; ARM: uxth r0, r0
+; ARM: vmov s0, r0
+; ARM: vcvt.f32.u32 s0, s0
+; THUMB: uitofp_single_i16
+; THUMB: uxth r0, r0
+; THUMB: vmov s0, r0
+; THUMB: vcvt.f32.u32 s0, s0
+  %b.addr = alloca float, align 4
+  %conv = uitofp i16 %a to float
+  store float %conv, float* %b.addr, align 4
+  ret void
+}
+
+define void @uitofp_single_i8(i8 %a) nounwind ssp {
+entry:
+; ARM: uitofp_single_i8
+; ARM: uxtb r0, r0
+; ARM: vmov s0, r0
+; ARM: vcvt.f32.u32 s0, s0
+; THUMB: uitofp_single_i8
+; THUMB: uxtb r0, r0
+; THUMB: vmov s0, r0
+; THUMB: vcvt.f32.u32 s0, s0
+  %b.addr = alloca float, align 4
+  %conv = uitofp i8 %a to float
+  store float %conv, float* %b.addr, align 4
+  ret void
+}
+
+define void @uitofp_double_i32(i32 %a, double %b) nounwind ssp {
+entry:
+; ARM: uitofp_double_i32
+; ARM: vmov s0, r0
+; ARM: vcvt.f64.u32 d16, s0
+; THUMB: uitofp_double_i32
+; THUMB: vmov s0, r0
+; THUMB: vcvt.f64.u32 d16, s0
+  %b.addr = alloca double, align 8
+  %conv = uitofp i32 %a to double
+  store double %conv, double* %b.addr, align 8
+  ret void
+}
+
+define void @uitofp_double_i16(i16 %a, double %b) nounwind ssp {
+entry:
+; ARM: uitofp_double_i16
+; ARM: uxth r0, r0
+; ARM: vmov s0, r0
+; ARM: vcvt.f64.u32 d16, s0
+; THUMB: uitofp_double_i16
+; THUMB: uxth r0, r0
+; THUMB: vmov s0, r0
+; THUMB: vcvt.f64.u32 d16, s0
+  %b.addr = alloca double, align 8
+  %conv = uitofp i16 %a to double
+  store double %conv, double* %b.addr, align 8
+  ret void
+}
+
+define void @uitofp_double_i8(i8 %a, double %b) nounwind ssp {
+entry:
+; ARM: uitofp_double_i8
+; ARM: uxtb r0, r0
+; ARM: vmov s0, r0
+; ARM: vcvt.f64.u32 d16, s0
+; THUMB: uitofp_double_i8
+; THUMB: uxtb r0, r0
+; THUMB: vmov s0, r0
+; THUMB: vcvt.f64.u32 d16, s0
+  %b.addr = alloca double, align 8
+  %conv = uitofp i8 %a to double
+  store double %conv, double* %b.addr, align 8
+  ret void
+}
-- 
2.34.1