[FastIsel][X86] Add support for lowering the first 8 floating-point arguments.

Recommit with fixed argument attribute checking code, which is required to bail
out of all the cases we don't handle yet.

llvm-svn: 210815

1 files changed, 24 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/X86/fast-isel-args.ll b/llvm/test/CodeGen/X86/fast-isel-args.ll
index 0f3626565e7..8c86a9cc01d 100644
--- a/llvm/test/CodeGen/X86/fast-isel-args.ll
+++ b/llvm/test/CodeGen/X86/fast-isel-args.ll
@@ -23,3 +23,27 @@ entry:
   %add2 = add nsw i64 %add, %conv1
   ret i64 %add2
 }
+
+define float @t4(float %a, float %b, float %c, float %d, float %e, float %f, float %g, float %h) {
+entry:
+  %add1 = fadd float %a, %b
+  %add2 = fadd float %c, %d
+  %add3 = fadd float %e, %f
+  %add4 = fadd float %g, %h
+  %add5 = fadd float %add1, %add2
+  %add6 = fadd float %add3, %add4
+  %add7 = fadd float %add5, %add6
+  ret float %add7
+}
+
+define double @t5(double %a, double %b, double %c, double %d, double %e, double %f, double %g, double %h) {
+entry:
+  %add1 = fadd double %a, %b
+  %add2 = fadd double %c, %d
+  %add3 = fadd double %e, %f
+  %add4 = fadd double %g, %h
+  %add5 = fadd double %add1, %add2
+  %add6 = fadd double %add3, %add4
+  %add7 = fadd double %add5, %add6
+  ret double %add7
+}