From 08a8923efc660d4f4cad7885771db91a305f32db Mon Sep 17 00:00:00 2001
From: "H.J. Lu" <hongjiu.lu@intel.com>
Date: Thu, 21 Jul 2011 22:22:00 +0000
Subject: [PATCH] Promote pointer function arguments and return values to
Pmode.
2011-07-21 H.J. Lu <hongjiu.lu@intel.com>
* config/i386/i386.c (function_value_64): Always return pointers
in Pmode.
(ix86_promote_function_mode): New.
(TARGET_PROMOTE_FUNCTION_MODE): Likewise.
From-SVN: r176593
---
gcc/ChangeLog | 7 +++++++
gcc/config/i386/i386.c | 24 ++++++++++++++++++++++++
2 files changed, 31 insertions(+)
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 023f4787586c..cf529042bf2b 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2011-07-21 H.J. Lu <hongjiu.lu@intel.com>
+
+ * config/i386/i386.c (function_value_64): Always return pointers
+ in Pmode.
+ (ix86_promote_function_mode): New.
+ (TARGET_PROMOTE_FUNCTION_MODE): Likewise.
+
2011-07-21 Bill Schmidt <wschmidt@linux.vnet.ibm.com>
PR tree-optimization/49749
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index da6c888ed464..957b51d6fc8a 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -7078,6 +7078,11 @@ function_value_64 (enum machine_mode orig_mode, enum machine_mode mode,
return gen_rtx_REG (mode, AX_REG);
}
}
+ else if (POINTER_TYPE_P (valtype))
+ {
+ /* Pointers are always returned in Pmode. */
+ mode = Pmode;
+ }
ret = construct_container (mode, orig_mode, valtype, 1,
X86_64_REGPARM_MAX, X86_64_SSE_REGPARM_MAX,
@@ -7147,6 +7152,22 @@ ix86_function_value (const_tree valtype, const_tree fntype_or_decl,
return ix86_function_value_1 (valtype, fntype_or_decl, orig_mode, mode);
}
+/* Pointer function arguments and return values are promoted to Pmode. */
+
+static enum machine_mode
+ix86_promote_function_mode (const_tree type, enum machine_mode mode,
+ int *punsignedp, const_tree fntype,
+ int for_return)
+{
+ if (type != NULL_TREE && POINTER_TYPE_P (type))
+ {
+ *punsignedp = POINTERS_EXTEND_UNSIGNED;
+ return Pmode;
+ }
+ return default_promote_function_mode (type, mode, punsignedp, fntype,
+ for_return);
+}
+
rtx
ix86_libcall_value (enum machine_mode mode)
{
@@ -34970,6 +34991,9 @@ ix86_autovectorize_vector_sizes (void)
#undef TARGET_FUNCTION_VALUE_REGNO_P
#define TARGET_FUNCTION_VALUE_REGNO_P ix86_function_value_regno_p
+#undef TARGET_PROMOTE_FUNCTION_MODE
+#define TARGET_PROMOTE_FUNCTION_MODE ix86_promote_function_mode
+
#undef TARGET_SECONDARY_RELOAD
#define TARGET_SECONDARY_RELOAD ix86_secondary_reload
--
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