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* [gcc r12-4883] Fix RTL frontend handling of const_vectors
@ 2021-11-04 8:29 Richard Sandiford
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From: Richard Sandiford @ 2021-11-04 8:29 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:95318d469f4d293446b4fd38d527fd5d64ce0b70
commit r12-4883-g95318d469f4d293446b4fd38d527fd5d64ce0b70
Author: Richard Sandiford <richard.sandiford@arm.com>
Date: Thu Nov 4 08:28:44 2021 +0000
Fix RTL frontend handling of const_vectors
The RTL frontend makes sure that CONST_INTs use shared rtxes where
appropriate. We should do the same thing for CONST_VECTORs,
reusing CONST0_RTX, CONST1_RTX and CONSTM1_RTX. This also has
the effect of setting CONST_VECTOR_NELTS_PER_PATTERN and
CONST_VECTOR_NPATTERNS.
While looking at where to add that, I noticed we had some dead #includes
in read-rtl.c. Some of the stuff that read-rtl-function.c does was once
in that file instead.
gcc/
* read-rtl.c: Remove dead !GENERATOR_FILE block.
* read-rtl-function.c (function_reader::consolidate_singletons):
Generate canonical CONST_VECTORs.
Diff:
---
gcc/read-rtl-function.c | 3 +++
gcc/read-rtl.c | 6 ------
2 files changed, 3 insertions(+), 6 deletions(-)
diff --git a/gcc/read-rtl-function.c b/gcc/read-rtl-function.c
index 941d1e158a3..5699f574a37 100644
--- a/gcc/read-rtl-function.c
+++ b/gcc/read-rtl-function.c
@@ -1498,6 +1498,9 @@ function_reader::consolidate_singletons (rtx x)
case CONST_INT:
return gen_rtx_CONST_INT (GET_MODE (x), INTVAL (x));
+ case CONST_VECTOR:
+ return gen_rtx_CONST_VECTOR (GET_MODE (x), XVEC (x, 0));
+
default:
break;
}
diff --git a/gcc/read-rtl.c b/gcc/read-rtl.c
index 041166658d1..b33dee06842 100644
--- a/gcc/read-rtl.c
+++ b/gcc/read-rtl.c
@@ -36,12 +36,6 @@ along with GCC; see the file COPYING3. If not see
#include "read-md.h"
#include "gensupport.h"
-#ifndef GENERATOR_FILE
-#include "function.h"
-#include "memmodel.h"
-#include "emit-rtl.h"
-#endif
-
/* One element in a singly-linked list of (integer, string) pairs. */
struct map_value {
struct map_value *next;
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