aarch64: Remove AARCH64_FL_RCPC8_4 [PR107025]

AARCH64_FL_RCPC8_4 is an odd-one-out in that it has no associated
entry in aarch64-option-extensions.def.  This means that, although
it is internally separated from AARCH64_FL_V8_4A, there is no
mechanism for turning it on and off individually, independently
of armv8.4-a.

The only place that the flag was used independently was in the
entry for thunderx3t110, which enabled it alongside V8_3A.
As noted in PR107025, this means that any use of the extension
will fail to assemble.

In the PR trail, Andrew suggested removing the core entry.
That might be best long-term, but since the barrier for removing
command-line options without a deprecation period is very high,
this patch instead just drops the flag from the core entry.
We'll still produce correct code.

gcc/
	PR target/107025
	* config/aarch64/aarch64.h (oAARCH64_FL_RCPC8_4): Delete.
	(AARCH64_FL_FOR_V8_4A): Update accordingly.
	(AARCH64_ISA_RCPC8_4): Use AARCH64_FL_V8_4A directly.
	* config/aarch64/aarch64-cores.def (thunderx3t110): Remove
	AARCH64_FL_RCPC8_4.

diff --git a/gcc/config/aarch64/aarch64-cores.def b/gcc/config/aarch64/aarch64-cores.def
index 008b0b8c177a98be4ce4d9f619614aea5836a5f8..cf500d0a9814372ea124ee700cc00d67dbdc24cf 100644 (file)
--- a/gcc/config/aarch64/aarch64-cores.def
+++ b/gcc/config/aarch64/aarch64-cores.def
@@ -133,7 +133,7 @@ AARCH64_CORE("tsv110",  tsv110, tsv110, V8_2A,  AARCH64_FL_CRYPTO | AARCH64_FL_F
 /* ARMv8.3-A Architecture Processors.  */
 
 /* Marvell cores (TX3). */
-AARCH64_CORE("thunderx3t110",  thunderx3t110,  thunderx3t110, V8_3A,  AARCH64_FL_CRYPTO | AARCH64_FL_RCPC | AARCH64_FL_SM4 | AARCH64_FL_SHA3 | AARCH64_FL_F16FML | AARCH64_FL_RCPC8_4, thunderx3t110, 0x43, 0x0b8, 0x0a)
+AARCH64_CORE("thunderx3t110",  thunderx3t110,  thunderx3t110, V8_3A,  AARCH64_FL_CRYPTO | AARCH64_FL_RCPC | AARCH64_FL_SM4 | AARCH64_FL_SHA3 | AARCH64_FL_F16FML, thunderx3t110, 0x43, 0x0b8, 0x0a)
 
 /* ARMv8.4-A Architecture Processors.  */
 

diff --git a/gcc/config/aarch64/aarch64.h b/gcc/config/aarch64/aarch64.h
index c275548b18e7d7fd3aa9c92c850cb90ec9a03ee3..8ea8e2a39132e3caba17d9390c2d7fef88d42c22 100644 (file)
--- a/gcc/config/aarch64/aarch64.h
+++ b/gcc/config/aarch64/aarch64.h
@@ -173,7 +173,6 @@
 #define AARCH64_FL_SM4       (1 << 17)  /* Has ARMv8.4-A SM3 and SM4.  */
 #define AARCH64_FL_SHA3              (1 << 18)  /* Has ARMv8.4-a SHA3 and SHA512.  */
 #define AARCH64_FL_F16FML     (1 << 19)  /* Has ARMv8.4-a FP16 extensions.  */
-#define AARCH64_FL_RCPC8_4    (1 << 20)  /* Has ARMv8.4-a RCPC extensions.  */
 
 /* Statistical Profiling extensions.  */
 #define AARCH64_FL_PROFILE    (1 << 21)
@@ -265,7 +264,7 @@
   (AARCH64_FL_FOR_V8_2A | AARCH64_FL_V8_3A | AARCH64_FL_PAUTH)
 #define AARCH64_FL_FOR_V8_4A                   \
   (AARCH64_FL_FOR_V8_3A | AARCH64_FL_V8_4A | AARCH64_FL_F16FML \
-   | AARCH64_FL_DOTPROD | AARCH64_FL_RCPC8_4 | AARCH64_FL_FLAGM)
+   | AARCH64_FL_DOTPROD | AARCH64_FL_FLAGM)
 #define AARCH64_FL_FOR_V8_5A                   \
   (AARCH64_FL_FOR_V8_4A | AARCH64_FL_V8_5A     \
    | AARCH64_FL_SB | AARCH64_FL_SSBS | AARCH64_FL_PREDRES)
@@ -313,7 +312,7 @@
 #define AARCH64_ISA_SM4                   (aarch64_isa_flags & AARCH64_FL_SM4)
 #define AARCH64_ISA_SHA3          (aarch64_isa_flags & AARCH64_FL_SHA3)
 #define AARCH64_ISA_F16FML        (aarch64_isa_flags & AARCH64_FL_F16FML)
-#define AARCH64_ISA_RCPC8_4       (aarch64_isa_flags & AARCH64_FL_RCPC8_4)
+#define AARCH64_ISA_RCPC8_4       (aarch64_isa_flags & AARCH64_FL_V8_4A)
 #define AARCH64_ISA_RNG                   (aarch64_isa_flags & AARCH64_FL_RNG)
 #define AARCH64_ISA_V8_5A         (aarch64_isa_flags & AARCH64_FL_V8_5A)
 #define AARCH64_ISA_TME                   (aarch64_isa_flags & AARCH64_FL_TME)