Add a test for the MachineCopyPropagation change landed in r238518.

[oota-llvm.git] / test / CodeGen / X86 / force-align-stack-alloca.ll

diff --git a/test/CodeGen/X86/force-align-stack-alloca.ll b/test/CodeGen/X86/force-align-stack-alloca.ll
index 48f963f58e8a75979efdb4508ce9771b1f2bb699..a9ba20f45e845ad0e6149e5c7a68e7bde0a6b7c4 100644 (file)
--- a/test/CodeGen/X86/force-align-stack-alloca.ll
+++ b/test/CodeGen/X86/force-align-stack-alloca.ll
@@ -3,24 +3,29 @@
 ; arbitrarily force alignment up to 32-bytes for i386 hoping that this will
 ; exceed any ABI provisions.
 ;
-; RUN: llc < %s -force-align-stack -stack-alignment=32 | FileCheck %s
+; RUN: llc < %s -mcpu=generic -force-align-stack -stack-alignment=32 | FileCheck %s
 
 target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32-n8:16:32-S128"
 target triple = "i386-unknown-linux-gnu"
 
 define i32 @f(i8* %p) nounwind {
 entry:
-  %0 = load i8* %p
+  %0 = load i8, i8* %p
   %conv = sext i8 %0 to i32
   ret i32 %conv
 }
 
 define i64 @g(i32 %i) nounwind {
-; CHECK: g:
-; CHECK:      pushl
+; CHECK-LABEL: g:
+; CHECK:      pushl  %ebp
 ; CHECK-NEXT: movl   %esp, %ebp
 ; CHECK-NEXT: pushl
-; CHECK-NEXT: subl   $20, %esp
+; CHECK-NEXT: pushl
+; CHECK-NEXT: andl   $-32, %esp
+; CHECK-NEXT: subl   $32, %esp
+;
+; Now setup the base pointer (%esi).
+; CHECK-NEXT: movl   %esp, %esi
 ; CHECK-NOT:         {{[^ ,]*}}, %esp
 ;
 ; The next adjustment of the stack is due to the alloca.
@@ -28,25 +33,27 @@ define i64 @g(i32 %i) nounwind {
 ; CHECK-NOT:         {{[^ ,]*}}, %esp
 ;
 ; Next we set up the memset call, and then undo it.
-; CHECK:      subl   $32, %esp
+; CHECK:      subl   $20, %esp
 ; CHECK-NOT:         {{[^ ,]*}}, %esp
 ; CHECK:      calll  memset
 ; CHECK-NEXT: addl   $32, %esp
 ; CHECK-NOT:         {{[^ ,]*}}, %esp
 ;
 ; Next we set up the call to 'f'.
-; CHECK:      subl   $32, %esp
+; CHECK:      subl   $28, %esp
 ; CHECK-NOT:         {{[^ ,]*}}, %esp
 ; CHECK:      calll  f
 ; CHECK-NEXT: addl   $32, %esp
 ; CHECK-NOT:         {{[^ ,]*}}, %esp
 ;
-; Finally we nede to restore %esp from %ebp, the alloca prevents us from
-; restoring it directly.
+; Restore %esp from %ebp (frame pointer) and subtract the size of
+; zone with callee-saved registers to pop them.
+; This is the state prior to stack realignment and the allocation of VLAs.
 ; CHECK-NOT:  popl
-; CHECK:      leal   -4(%ebp), %esp
+; CHECK:      leal   -8(%ebp), %esp
 ; CHECK-NEXT: popl
 ; CHECK-NEXT: popl
+; CHECK-NEXT: popl   %ebp
 ; CHECK-NEXT: ret
 
 entry: