FastISel: don't cache values across the calls (they usually spill on the stack anyway)

test/CodeGen/X86/fast-isel-x86-64.ll

 ; RUN: llc < %s  -fast-isel -O0 -regalloc=fast -asm-verbose=0 -fast-isel-abort | FileCheck %s
 
 target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
 target triple = "x86_64-apple-darwin10.0.0"
 
 ; Make sure that fast-isel folds the immediate into the binop even though it
 ; is non-canonical.
 define i32 @test1(i32 %i) nounwind ssp {
   %and = and i32 8, %i
   ret i32 %and
@@ skipping 241 matching lines @@
 }
 declare void @test20sret(%struct.a* sret)
 
 ; Check that -0.0 is not materialized using pxor
 define void @test21(double* %p1) {
   store double -0.0, double* %p1
   ret void
 ; CHECK: test21:
 ; CHECK-NOT: pxor
 ; CHECK: movsd  LCPI
-}
+}
+
+; Check that immediate arguments to a function
+; do not cause massive spilling and are used
+; as immediates just before the call.
+define void @test22() nounwind {
+entry:
+  call void @foo22(i32 0)
+  call void @foo22(i32 1)
+  call void @foo22(i32 2)
+  call void @foo22(i32 3)
+  ret void
+; CHECK: test22:
+; CHECK: movl   $0, %edi
+; CHECK: callq  _foo22
+; CHECK: movl   $1, %edi
+; CHECK: callq  _foo22
+; CHECK: movl   $2, %edi
+; CHECK: callq  _foo22
+; CHECK: movl   $3, %edi
+; CHECK: callq  _foo22
+}
+
+declare void @foo22(i32)