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aix: Permit use of AIX Vector extended ABI mode

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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.
This commit is contained in:
David Edelsohn 2021-01-27 16:47:22 -05:00
parent 92dd3e71f9
commit 2e7750cb51
4 changed files with 20 additions and 3 deletions
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2
gcc/config/rs6000/rs6000-c.c
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@ -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:

5
gcc/config/rs6000/rs6000.c
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@ -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;
}

11
gcc/config/rs6000/rs6000.opt
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@ -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.

5
gcc/doc/invoke.texi
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@ -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