x87 FPU state instructions do not use an f32 memory location

[epastor]

Summary

These instructions actually use a 512-byte location, where bytes 464-511 are ignored.

[craig.topper]

LGTM

llvm/lib/Target/X86/X86InstrFPStack.td

 def FICOMP16m: FPI<0xDE, MRM3m, (outs), (ins i16mem:$src), "ficomp{s}\t$src">;
 
 def FICOM32m : FPI<0xDA, MRM2m, (outs), (ins i32mem:$src), "ficom{l}\t$src">;
 def FICOMP32m: FPI<0xDA, MRM3m, (outs), (ins i32mem:$src), "ficomp{l}\t$src">;
 } // SchedRW
 
 let SchedRW = [WriteMicrocoded] in {
 let Defs = [FPSW, FPCW], mayLoad = 1 in {
-def FLDENVm  : FPI<0xD9, MRM4m, (outs), (ins f32mem:$src), "fldenv\t$src">;
-def FRSTORm  : FPI<0xDD, MRM4m, (outs), (ins f32mem:$dst), "frstor\t$dst">;
+def FLDENVm  : FPI<0xD9, MRM4m, (outs), (ins anymem:$src), "fldenv\t$src">;
+def FRSTORm  : FPI<0xDD, MRM4m, (outs), (ins anymem:$src), "frstor\t$src">;
 }
 
 let Defs = [FPSW, FPCW], Uses = [FPSW, FPCW], mayStore = 1 in {
-def FSTENVm  : FPI<0xD9, MRM6m, (outs), (ins f32mem:$dst), "fnstenv\t$dst">;
-def FSAVEm   : FPI<0xDD, MRM6m, (outs), (ins f32mem:$dst), "fnsave\t$dst">;
+def FSTENVm  : FPI<0xD9, MRM6m, (outs), (ins anymem:$dst), "fnstenv\t$dst">;
+def FSAVEm   : FPI<0xDD, MRM6m, (outs), (ins anymem:$dst), "fnsave\t$dst">;
 }
 
 let Uses = [FPSW], mayStore = 1 in
 def FNSTSWm  : FPI<0xDD, MRM7m, (outs), (ins i16mem:$dst), "fnstsw\t$dst">;
 
 let mayLoad = 1 in
 def FBLDm    : FPI<0xDF, MRM4m, (outs), (ins f80mem:$src), "fbld\t$src">;
 let Uses = [FPCW] ,mayRaiseFPException = 1, mayStore = 1 in