Richard,
This patch series adds analysis of register usage of functions for usage by IRA.
The original post is here
( http://gcc.gnu.org/ml/gcc-patches/2013-01/msg01234.html ).
This patch implements the target hook TARGET_FN_OTHER_HARD_REG_USAGE for ARM.
The target hook TARGET_FN_OTHER_HARD_REG_USAGE was introduced in the previous
patch in this patch series.
Build and reg-tested on ARM.
OK for trunk?
Thanks,
-Tom
2013-03-29 Radovan Obradovic <[email protected]>
Tom de Vries <[email protected]>
* config/arm/arm.c (TARGET_FN_OTHER_HARD_REG_USAGE): Redefine as
arm_fn_other_hard_reg_usage.
(arm_fn_other_hard_reg_usage): New function.
diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c
index 5f63a2e..341fa86 100644
--- a/gcc/config/arm/arm.c
+++ b/gcc/config/arm/arm.c
@@ -280,6 +280,7 @@ static unsigned arm_add_stmt_cost (void *data, int count,
static void arm_canonicalize_comparison (int *code, rtx *op0, rtx *op1,
bool op0_preserve_value);
+static void arm_fn_other_hard_reg_usage (struct hard_reg_set_container *);
/* Table of machine attributes. */
static const struct attribute_spec arm_attribute_table[] =
@@ -649,6 +650,10 @@ static const struct attribute_spec arm_attribute_table[] =
#define TARGET_CANONICALIZE_COMPARISON \
arm_canonicalize_comparison
+#undef TARGET_FN_OTHER_HARD_REG_USAGE
+#define TARGET_FN_OTHER_HARD_REG_USAGE \
+ arm_fn_other_hard_reg_usage
+
struct gcc_target targetm = TARGET_INITIALIZER;
/* Obstack for minipool constant handling. */
@@ -3762,6 +3767,19 @@ arm_canonicalize_comparison (int *code, rtx *op0, rtx *op1,
}
}
+/* Implement TARGET_FN_OTHER_HARD_REG_USAGE. */
+
+static void
+arm_fn_other_hard_reg_usage (struct hard_reg_set_container *regs)
+{
+ if (TARGET_AAPCS_BASED)
+ {
+ /* For AAPCS, IP and CC can be clobbered by veneers inserted by the
+ linker. */
+ SET_HARD_REG_BIT (regs->set, IP_REGNUM);
+ SET_HARD_REG_BIT (regs->set, CC_REGNUM);
+ }
+}
/* Define how to find the value returned by a function. */
