diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index b7087f0e21a0..08f63104473f 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,12 @@
+2008-11-18  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/38130
+	* config/i386/i386.md (allocate_stack_worker_32,
+	allocate_stack_worker_64): Don't use match_dup between input and
+	output operand.
+	(allocate_stack): Adjust gen_stack_worker_{32,64} caller.
+	* config/i386/i386.c (ix86_expand_prologue): Likewise.
+
 2008-11-18  Kai Tietz  <kai.tietz@onevision.com>
 
 	* config/i386/t-cygming (SHLIB_LINK): Make sure that $(SHLIB_MAP).def
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index 38da3a4a1f6a..f84f326cef7f 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -7989,9 +7989,9 @@ ix86_expand_prologue (void)
       emit_move_insn (eax, GEN_INT (allocate));
 
       if (TARGET_64BIT)
-	insn = gen_allocate_stack_worker_64 (eax);
+	insn = gen_allocate_stack_worker_64 (eax, eax);
       else
-	insn = gen_allocate_stack_worker_32 (eax);
+	insn = gen_allocate_stack_worker_32 (eax, eax);
       insn = emit_insn (insn);
       RTX_FRAME_RELATED_P (insn) = 1;
       t = gen_rtx_PLUS (Pmode, stack_pointer_rtx, GEN_INT (-allocate));
diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index 055add495feb..d49e49a3eb41 100644
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -20196,9 +20196,10 @@
    (set_attr "mode" "DI")])
 
 (define_insn "allocate_stack_worker_32"
-  [(set (match_operand:SI 0 "register_operand" "+a")
-	(unspec_volatile:SI [(match_dup 0)] UNSPECV_STACK_PROBE))
-   (set (reg:SI SP_REG) (minus:SI (reg:SI SP_REG) (match_dup 0)))
+  [(set (match_operand:SI 0 "register_operand" "=a")
+	(unspec_volatile:SI [(match_operand:SI 1 "register_operand" "0")]
+			    UNSPECV_STACK_PROBE))
+   (set (reg:SI SP_REG) (minus:SI (reg:SI SP_REG) (match_dup 1)))
    (clobber (reg:CC FLAGS_REG))]
   "!TARGET_64BIT && TARGET_STACK_PROBE"
   "call\t___chkstk"
@@ -20206,9 +20207,10 @@
    (set_attr "length" "5")])
 
 (define_insn "allocate_stack_worker_64"
-  [(set (match_operand:DI 0 "register_operand" "+a")
-	(unspec_volatile:DI [(match_dup 0)] UNSPECV_STACK_PROBE))
-   (set (reg:DI SP_REG) (minus:DI (reg:DI SP_REG) (match_dup 0)))
+  [(set (match_operand:DI 0 "register_operand" "=a")
+	(unspec_volatile:DI [(match_operand:DI 1 "register_operand" "0")]
+			    UNSPECV_STACK_PROBE))
+   (set (reg:DI SP_REG) (minus:DI (reg:DI SP_REG) (match_dup 1)))
    (clobber (reg:DI R10_REG))
    (clobber (reg:DI R11_REG))
    (clobber (reg:CC FLAGS_REG))]
@@ -20240,9 +20242,9 @@
     {
       x = copy_to_mode_reg (Pmode, operands[1]);
       if (TARGET_64BIT)
-	x = gen_allocate_stack_worker_64 (x);
+	x = gen_allocate_stack_worker_64 (x, x);
       else
-	x = gen_allocate_stack_worker_32 (x);
+	x = gen_allocate_stack_worker_32 (x, x);
       emit_insn (x);
     }