[X86/FastIsel] Fall-back to SelectionDAG when lowering soft-floats.
FastIsel can't handle them, so we would end up crashing during
register class selection.
Fixes PR26522.
Differential Revision: https://reviews.llvm.org/D35272
llvm-svn: 307797
diff --git a/llvm/lib/Target/X86/X86FastISel.cpp b/llvm/lib/Target/X86/X86FastISel.cpp
index 621505a..ee9e781 100644
--- a/llvm/lib/Target/X86/X86FastISel.cpp
+++ b/llvm/lib/Target/X86/X86FastISel.cpp
@@ -3039,6 +3039,9 @@
if (!Subtarget->is64Bit())
return false;
+ if (Subtarget->useSoftFloat())
+ return false;
+
// Only handle simple cases. i.e. Up to 6 i32/i64 scalar arguments.
unsigned GPRCnt = 0;
unsigned FPRCnt = 0;