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[9/9] Make bitsize_mode_for_mode return an opt_mode
- From: Richard Sandiford <richard dot sandiford at linaro dot org>
- To: gcc-patches at gcc dot gnu dot org
- Date: Mon, 04 Sep 2017 12:43:15 +0100
- Subject: [9/9] Make bitsize_mode_for_mode return an opt_mode
- Authentication-results: sourceware.org; auth=none
- References: <87tw0iiu51.fsf@linaro.org>
2017-09-04 Richard Sandiford <richard.sandiford@linaro.org>
gcc/
* machmode.h (bitwise_mode_for_mode): Return opt_mode.
* stor-layout.c (bitwise_mode_for_mode): Likewise.
(bitwise_type_for_mode): Update accordingly.
Index: gcc/machmode.h
===================================================================
--- gcc/machmode.h 2017-09-04 12:18:55.821333642 +0100
+++ gcc/machmode.h 2017-09-04 12:19:42.856108173 +0100
@@ -694,7 +694,7 @@ smallest_int_mode_for_size (unsigned int
}
extern opt_scalar_int_mode int_mode_for_mode (machine_mode);
-extern machine_mode bitwise_mode_for_mode (machine_mode);
+extern opt_machine_mode bitwise_mode_for_mode (machine_mode);
extern opt_machine_mode mode_for_vector (scalar_mode, unsigned);
extern opt_machine_mode mode_for_int_vector (unsigned int, unsigned int);
Index: gcc/stor-layout.c
===================================================================
--- gcc/stor-layout.c 2017-09-04 12:19:01.144339518 +0100
+++ gcc/stor-layout.c 2017-09-04 12:19:42.856108173 +0100
@@ -404,10 +404,10 @@ int_mode_for_mode (machine_mode mode)
}
}
-/* Find a mode that can be used for efficient bitwise operations on MODE.
- Return BLKmode if no such mode exists. */
+/* Find a mode that can be used for efficient bitwise operations on MODE,
+ if one exists. */
-machine_mode
+opt_machine_mode
bitwise_mode_for_mode (machine_mode mode)
{
/* Quick exit if we already have a suitable mode. */
@@ -445,7 +445,7 @@ bitwise_mode_for_mode (machine_mode mode
}
/* Otherwise fall back on integers while honoring MAX_FIXED_MODE_SIZE. */
- return mode_for_size (bitsize, MODE_INT, true).else_blk ();
+ return mode_for_size (bitsize, MODE_INT, true);
}
/* Find a type that can be used for efficient bitwise operations on MODE.
@@ -454,8 +454,7 @@ bitwise_mode_for_mode (machine_mode mode
tree
bitwise_type_for_mode (machine_mode mode)
{
- mode = bitwise_mode_for_mode (mode);
- if (mode == BLKmode)
+ if (!bitwise_mode_for_mode (mode).exists (&mode))
return NULL_TREE;
unsigned int inner_size = GET_MODE_UNIT_BITSIZE (mode);