poly_int: PUSH_ROUNDING

PUSH_ROUNDING is difficult to convert to a hook since there is still
a lot of conditional code based on it.  It isn't clear that a direct
conversion with checks for null hooks is the right thing to do.

Rather than untangle that, this patch converts all implementations
that do something to out-of-line functions that have the same
interface as a hook would have.  This should at least help towards
any future hook conversion.

2018-01-03  Richard Sandiford  <richard.sandiford@linaro.org>
	    Alan Hayward  <alan.hayward@arm.com>
	    David Sherwood  <david.sherwood@arm.com>

gcc/
	* config/cr16/cr16-protos.h (cr16_push_rounding): Declare.
	* config/cr16/cr16.h (PUSH_ROUNDING): Move implementation to...
	* config/cr16/cr16.c (cr16_push_rounding): ...this new function.
	* config/h8300/h8300-protos.h (h8300_push_rounding): Declare.
	* config/h8300/h8300.h (PUSH_ROUNDING): Move implementation to...
	* config/h8300/h8300.c (h8300_push_rounding): ...this new function.
	* config/i386/i386-protos.h (ix86_push_rounding): Declare.
	* config/i386/i386.h (PUSH_ROUNDING): Move implementation to...
	* config/i386/i386.c (ix86_push_rounding): ...this new function.
	* config/m32c/m32c-protos.h (m32c_push_rounding): Take and return
	a poly_int64.
	* config/m32c/m32c.c (m32c_push_rounding): Likewise.
	* config/m68k/m68k-protos.h (m68k_push_rounding): Declare.
	* config/m68k/m68k.h (PUSH_ROUNDING): Move implementation to...
	* config/m68k/m68k.c (m68k_push_rounding): ...this new function.
	* config/pdp11/pdp11-protos.h (pdp11_push_rounding): Declare.
	* config/pdp11/pdp11.h (PUSH_ROUNDING): Move implementation to...
	* config/pdp11/pdp11.c (pdp11_push_rounding): ...this new function.
	* config/stormy16/stormy16-protos.h (xstormy16_push_rounding): Declare.
	* config/stormy16/stormy16.h (PUSH_ROUNDING): Move implementation to...
	* config/stormy16/stormy16.c (xstormy16_push_rounding): ...this new
	function.
	* expr.c (emit_move_resolve_push): Treat the input and result
	of PUSH_ROUNDING as a poly_int64.
	(emit_move_complex_push, emit_single_push_insn_1): Likewise.
	(emit_push_insn): Likewise.
	* lra-eliminations.c (mark_not_eliminable): Likewise.
	* recog.c (push_operand): Likewise.
	* reload1.c (elimination_effects): Likewise.
	* rtlanal.c (nonzero_bits1): Likewise.
	* calls.c (store_one_arg): Likewise.  Require the padding to be
	known at compile time.

Co-Authored-By: Alan Hayward <alan.hayward@arm.com>
Co-Authored-By: David Sherwood <david.sherwood@arm.com>

From-SVN: r256155

3 files changed, 11 insertions, 4 deletions

diff --git a/gcc/config/pdp11/pdp11-protos.h b/gcc/config/pdp11/pdp11-protos.h
index f6c7d1a..467b0d8 100644
--- a/gcc/config/pdp11/pdp11-protos.h
+++ b/gcc/config/pdp11/pdp11-protos.h
@@ -44,3 +44,4 @@ extern void pdp11_asm_output_var (FILE *, const char *, int, int, bool);
 extern void pdp11_expand_prologue (void);
 extern void pdp11_expand_epilogue (void);
 extern int pdp11_branch_cost (void);
+extern poly_int64 pdp11_push_rounding (poly_int64);
diff --git a/gcc/config/pdp11/pdp11.c b/gcc/config/pdp11/pdp11.c
index 06fef13..1367a07 100644
--- a/gcc/config/pdp11/pdp11.c
+++ b/gcc/config/pdp11/pdp11.c
@@ -1977,4 +1977,13 @@ pdp11_modes_tieable_p (machine_mode, machine_mode)
   return false;
 }
 
+/* Implement PUSH_ROUNDING.  On the pdp11, the stack is on an even
+   boundary.  */
+
+poly_int64
+pdp11_push_rounding (poly_int64 bytes)
+{
+  return (bytes + 1) & ~1;
+}
+
 struct gcc_target targetm = TARGET_INITIALIZER;
diff --git a/gcc/config/pdp11/pdp11.h b/gcc/config/pdp11/pdp11.h
index 115bb5b..5ccec18 100644
--- a/gcc/config/pdp11/pdp11.h
+++ b/gcc/config/pdp11/pdp11.h
@@ -257,10 +257,7 @@ enum reg_class { NO_REGS, MUL_REGS, GENERAL_REGS, LOAD_FPU_REGS, NO_LOAD_FPU_REG
 */
 #define FRAME_GROWS_DOWNWARD 1
 
-/* If we generate an insn to push BYTES bytes,
-   this says how many the stack pointer really advances by.
-   On the pdp11, the stack is on an even boundary */
-#define PUSH_ROUNDING(BYTES) ((BYTES + 1) & ~1)
+#define PUSH_ROUNDING(BYTES) pdp11_push_rounding (BYTES)
 
 /* current_first_parm_offset stores the # of registers pushed on the 
    stack */