Comment had a typo. Fix it and clarify.
gcc/ChangeLog:
2019-10-13 Dimitar Dimitrov <dimi...@dinux.eu>
* config/pru/pru.h: Clarify R3/RA ABI.
Signed-off-by: Dimitar Dimitrov <dimi...@dinux.eu>
---
gcc/config/pru/pru.h | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/gcc/config/pru/pru.h b/gcc/config/pru/pru.h
index 15fb637dec6..f2bdd1ef02b 100644
--- a/gcc/config/pru/pru.h
+++ b/gcc/config/pru/pru.h
@@ -125,7 +125,8 @@
1 r1 Caller Saved. Also used as a temporary by function.
profiler and function prologue/epilogue.
2 r2 sp Stack Pointer.
- 3* r3.w0 ra Return Address (16-bit).
+ 3* r3.w0 ABI does not specify if it is caller or
callee saved.
+ 3* r3.w2 ra Return Address (16-bit).
4 r4 fp Frame Pointer, also called Argument Pointer in ABI.
5-13 r5-r13 Callee Saved Registers.
14-29 r14-r29 Register Arguments. Caller Saved Registers.
@@ -148,6 +149,11 @@
of 8 bit sub-registers (e.g. RA starts at r12). When outputting assembly,
GCC will take into account the RTL operand size (e.g. r12:HI) in order to
translate to the conventional PRU ISA format expected by GAS (r3.w0).
+
+ TI ISA documentation (SPRUHV7C) does not mark r3.w0 as neither
+ caller-saved nor callee-saved. So until TI clarifies, let's mark
+ it as fixed.
+
*/
#define FIXED_REGISTERS \
--
2.20.1
