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* [gcc r12-2268] docs: Add 'S' to Machine Constraints for RISC-V
@ 2021-07-13 6:10 Kito Cheng
0 siblings, 0 replies; only message in thread
From: Kito Cheng @ 2021-07-13 6:10 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:18a463bb666cc8f3421589e7641ec617acb84741
commit r12-2268-g18a463bb666cc8f3421589e7641ec617acb84741
Author: Kito Cheng <kito.cheng@sifive.com>
Date: Fri Jul 2 10:19:30 2021 +0800
docs: Add 'S' to Machine Constraints for RISC-V
It was undocument before, but it might used in linux kernel for resolve
code model issue, so LLVM community suggest we should document that,
so that make it become supported/documented/non-internal machine constraints.
gcc/ChangeLog:
PR target/101275
* config/riscv/constraints.md ("S"): Update description and remove
@internal.
* doc/md.texi (Machine Constraints): Document the 'S' constraints
for RISC-V.
Diff:
---
gcc/config/riscv/constraints.md | 3 +--
gcc/doc/md.texi | 3 +++
2 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/gcc/config/riscv/constraints.md b/gcc/config/riscv/constraints.md
index 8c15c6c0486..c87d5b796a5 100644
--- a/gcc/config/riscv/constraints.md
+++ b/gcc/config/riscv/constraints.md
@@ -67,8 +67,7 @@
(match_test "GET_CODE(XEXP(op,0)) == REG")))
(define_constraint "S"
- "@internal
- A constant call address."
+ "A constraint that matches an absolute symbolic address."
(match_operand 0 "absolute_symbolic_operand"))
(define_constraint "U"
diff --git a/gcc/doc/md.texi b/gcc/doc/md.texi
index 0fe70b7ea40..8225a768a5c 100644
--- a/gcc/doc/md.texi
+++ b/gcc/doc/md.texi
@@ -3536,6 +3536,9 @@ A 5-bit unsigned immediate for CSR access instructions.
@item A
An address that is held in a general-purpose register.
+@item S
+A constraint that matches an absolute symbolic address.
+
@end table
@item RX---@file{config/rx/constraints.md}
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