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authorDavid Edelsohn <dje.gcc@gmail.com>2021-01-27 16:47:22 -0500
committerDavid Edelsohn <dje.gcc@gmail.com>2021-01-30 12:08:00 -0500
commit2e7750cb518f5abedbd6fb2725882079a6934dce (patch)
tree3c2f26f33e101db09a2eebcdd6824214e9c96674
parent92dd3e71f957c7818f4ce4189bd187b59af20d9b (diff)
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aix: Permit use of AIX Vector extended ABI mode
AIX only permits use of Altivec VSRs 20-31 in a Vector Extended ABI mode. This patch explicitly enables use of the VSRs using the new -mabi=vec-extabi command line option also implemented in LLVM for AIX. Bootstrapped on powerpc-ibm-aix7.2.3.0 and powerpc64le-linux-gnu. gcc/ChangeLog: * config/rs6000/rs6000.opt (mabi=vec-extabi): New. (mabi=vec-default): New. * config/rs6000/rs6000-c.c (rs6000_target_modify_macros): Define __EXTABI__ for AIX Vector extended ABI. * config/rs6000/rs6000.c (rs6000_debug_reg_global): Print AIX Vector extabi info. (conditional_register_usage): If AIX vec_extabi enabled, vs20-vs31 are non-volatile. * doc/invoke.texi (PowerPC mabi): Add AIX vec-extabi and vec-default.
-rw-r--r--gcc/config/rs6000/rs6000-c.c2
-rw-r--r--gcc/config/rs6000/rs6000.c5
-rw-r--r--gcc/config/rs6000/rs6000.opt11
-rw-r--r--gcc/doc/invoke.texi5
4 files changed, 20 insertions, 3 deletions
diff --git a/gcc/config/rs6000/rs6000-c.c b/gcc/config/rs6000/rs6000-c.c
index 656cdb3..06b3bc0 100644
--- a/gcc/config/rs6000/rs6000-c.c
+++ b/gcc/config/rs6000/rs6000-c.c
@@ -483,6 +483,8 @@ rs6000_target_modify_macros (bool define_p, HOST_WIDE_INT flags,
/* Define this when supporting context-sensitive keywords. */
if (!flag_iso)
rs6000_define_or_undefine_macro (define_p, "__APPLE_ALTIVEC__");
+ if (rs6000_aix_extabi)
+ rs6000_define_or_undefine_macro (define_p, "__EXTABI__");
}
/* Note that the OPTION_MASK_VSX flag is automatically turned on in
the following conditions:
diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index fbaff28..0d5ef38 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -2512,6 +2512,9 @@ rs6000_debug_reg_global (void)
if (rs6000_altivec_abi)
fprintf (stderr, DEBUG_FMT_S, "altivec_abi", "true");
+ if (rs6000_aix_extabi)
+ fprintf (stderr, DEBUG_FMT_S, "AIX vec-extabi", "true");
+
if (rs6000_darwin64_abi)
fprintf (stderr, DEBUG_FMT_S, "darwin64_abi", "true");
@@ -9815,7 +9818,7 @@ rs6000_conditional_register_usage (void)
call_used_regs[i] = 1;
/* AIX reserves VR20:31 in non-extended ABI mode. */
- if (TARGET_XCOFF)
+ if (TARGET_XCOFF && !rs6000_aix_extabi)
for (i = FIRST_ALTIVEC_REGNO + 20; i < FIRST_ALTIVEC_REGNO + 32; ++i)
fixed_regs[i] = call_used_regs[i] = 1;
}
diff --git a/gcc/config/rs6000/rs6000.opt b/gcc/config/rs6000/rs6000.opt
index 6240f77..7aaabf3 100644
--- a/gcc/config/rs6000/rs6000.opt
+++ b/gcc/config/rs6000/rs6000.opt
@@ -352,6 +352,7 @@ mdebug=
Target RejectNegative Joined
-mdebug= Enable debug output.
+; Altivec ABI
mabi=altivec
Target RejectNegative Var(rs6000_altivec_abi) Save
Use the AltiVec ABI extensions.
@@ -360,6 +361,16 @@ mabi=no-altivec
Target RejectNegative Var(rs6000_altivec_abi, 0)
Do not use the AltiVec ABI extensions.
+; AIX Extended vector ABI
+mabi=vec-extabi
+Target RejectNegative Var(rs6000_aix_extabi, 1) Save
+Use the AIX Vector Extended ABI
+
+mabi=vec-default
+Target RejectNegative Var(rs6000_aix_extabi, 0)
+Do not use the AIX Vector Extended ABI
+
+; PPC64 Linux ELF ABI
mabi=elfv1
Target RejectNegative Var(rs6000_elf_abi, 1) Save
Use the ELFv1 ABI.
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index a89d385..3751bc3 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -27509,9 +27509,10 @@ SVR4 ABI)@.
@item -mabi=@var{abi-type}
@opindex mabi
Extend the current ABI with a particular extension, or remove such extension.
-Valid values are @samp{altivec}, @samp{no-altivec},
+Valid values are: @samp{altivec}, @samp{no-altivec},
@samp{ibmlongdouble}, @samp{ieeelongdouble},
-@samp{elfv1}, @samp{elfv2}@.
+@samp{elfv1}, @samp{elfv2},
+and for AIX: @samp{vec-extabi}, @samp{vec-default}@.
@item -mabi=ibmlongdouble
@opindex mabi=ibmlongdouble