[ARM] 't' asm constraint should accept i32

't' constraint normally only accepts f32 operands, but for VCVT the
operands can be i32. LLVM is overly restrictive and rejects asm like:

  float foo() {
    float result;
    __asm__ __volatile__(
      "vcvt.f32.s32 %[result], %[arg1]\n"
      : [result]"=t"(result)
      : [arg1]"t"(0x01020304) );
    return result;
  }

Relax the value type for 't' constraint to either f32 or i32.

Differential Revision: https://reviews.llvm.org/D40137

llvm-svn: 318472

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/lib/Target/ARM/ARMISelLowering.cpp b/llvm/lib/Target/ARM/ARMISelLowering.cpp
index 617675c7ca1..4f200ecfc28 100644
--- a/llvm/lib/Target/ARM/ARMISelLowering.cpp
+++ b/llvm/lib/Target/ARM/ARMISelLowering.cpp
@@ -13024,7 +13024,7 @@ RCPair ARMTargetLowering::getRegForInlineAsmConstraint(
         return RCPair(0U, &ARM::QPR_8RegClass);
       break;
     case 't':
-      if (VT == MVT::f32)
+      if (VT == MVT::f32 || VT == MVT::i32)
         return RCPair(0U, &ARM::SPRRegClass);
       break;
     }