[X86] Don't create FILD ISD nodes when X87 is disabled.

The included test case previously asserted because the type legalizer tried to soften the FILD ISD node.

Fixes PR38819.

llvm-svn: 342934

llvm/lib/Target/X86/X86ISelLowering.cpp

@@ -39073,7 +39073,8 @@ static SDValue combineSIntToFP(SDNode *N, SelectionDAG &DAG,
 
   // Transform (SINT_TO_FP (i64 ...)) into an x87 operation if we have
   // a 32-bit target where SSE doesn't support i64->FP operations.
-  if (!Subtarget.useSoftFloat() && Op0.getOpcode() == ISD::LOAD) {
+  if (!Subtarget.useSoftFloat() && Subtarget.hasX87() &&
+      Op0.getOpcode() == ISD::LOAD) {
     LoadSDNode *Ld = cast<LoadSDNode>(Op0.getNode());
     EVT LdVT = Ld->getValueType(0);
 

llvm/test/CodeGen/X86/pr38819.ll

@@ -0,0 +1,26 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple=i686-unknown-unknown -mattr=+sse,-sse2,-x87 | FileCheck %s
+
+define void @foo(i64 %x, float* %b) {
+; CHECK-LABEL: foo:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    pushl %esi
+; CHECK-NEXT:    .cfi_def_cfa_offset 8
+; CHECK-NEXT:    .cfi_offset %esi, -8
+; CHECK-NEXT:    movl {{[0-9]+}}(%esp), %esi
+; CHECK-NEXT:    pushl {{[0-9]+}}(%esp)
+; CHECK-NEXT:    .cfi_adjust_cfa_offset 4
+; CHECK-NEXT:    pushl {{[0-9]+}}(%esp)
+; CHECK-NEXT:    .cfi_adjust_cfa_offset 4
+; CHECK-NEXT:    calll __floatdisf
+; CHECK-NEXT:    addl $8, %esp
+; CHECK-NEXT:    .cfi_adjust_cfa_offset -8
+; CHECK-NEXT:    movl %eax, (%esi)
+; CHECK-NEXT:    popl %esi
+; CHECK-NEXT:    .cfi_def_cfa_offset 4
+; CHECK-NEXT:    retl
+entry:
+  %conv = sitofp i64 %x to float
+  store float %conv, float* %b
+  ret void
+}