Add support for GR32 <-> FR32 cross class copies.
We already support GR64 <-> VR128 copies. All of these copies break
partial register dependencies by zeroing the high part of the target
register.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140348 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86InstrInfo.cpp b/lib/Target/X86/X86InstrInfo.cpp
index 03471c7..614202c 100644
--- a/lib/Target/X86/X86InstrInfo.cpp
+++ b/lib/Target/X86/X86InstrInfo.cpp
@@ -2158,6 +2158,17 @@
return X86::MOV64toSDrr;
}
+ // SrcReg(FR32) -> DestReg(GR32)
+ // SrcReg(GR32) -> DestReg(FR32)
+
+ if (X86::GR32RegClass.contains(DestReg) && X86::FR32RegClass.contains(SrcReg))
+ // Copy from a FR32 register to a GR32 register.
+ return HasAVX ? X86::VMOVSS2DIrr : X86::MOVSS2DIrr;
+
+ if (X86::FR32RegClass.contains(DestReg) && X86::GR32RegClass.contains(SrcReg))
+ // Copy from a GR32 register to a FR32 register.
+ return HasAVX ? X86::VMOVDI2SSrr : X86::MOVDI2SSrr;
+
return 0;
}
