From 5caab10558516a72ea47941fc614a7615bf28504 Mon Sep 17 00:00:00 2001
From: Piotr Kubaj <pkubaj@FreeBSD.org>
Date: Sun, 6 Sep 2026 16:32:56 +0200
Subject: [PATCH] POWER: pass assembler CPU flags for more cores with clang on
 FreeBSD

clang with -fno-integrated-as does not translate -mcpu into CPU
selection flags for the external assembler the way GCC's ASM_CPU_SPEC
does, so GNU as runs with bare defaults and rejects AltiVec/VSX
mnemonics, both in the hand-written kernels and in clang's own
vectorized output.  This is already handled for POWER9/POWER10 via
-Wa,-mpwr10; do the equivalent for the remaining 64-bit cores:

  POWER8:  -Wa,-mpwr8
  POWER6:  -Wa,-mpwr6 -Wa,-maltivec
  PPC970:  -Wa,-mpwr4 -Wa,-maltivec

The POWER6/PPC970 spellings match what GCC passes to the assembler
for -mcpu=power6 and -mcpu=970.  Note a lone -Wa,-maltivec is not
enough: an explicit -m option replaces the assembler's implicit
64-bit default, making it reject even lwa/mulld.

Tested on FreeBSD/powerpc64 (big-endian) with clang 19.1.7:
TARGET=PPC970 and TARGET=POWER8 both build and pass the BLAS test
suite.
---
 Makefile.power | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Makefile.power b/Makefile.power
index 95f25d1dfc..fc56c9cd29 100644
--- a/Makefile.power
+++ b/Makefile.power
@@ -116,6 +116,15 @@ ifeq ($(OSNAME), FreeBSD)
 ifeq ($(CORE), $(filter $(CORE),POWER9 POWER10))
 CCOMMON_OPT += -Wa,-mpwr10
 endif
+ifeq ($(CORE), POWER8)
+CCOMMON_OPT += -Wa,-mpwr8
+endif
+ifeq ($(CORE), POWER6)
+CCOMMON_OPT += -Wa,-mpwr6 -Wa,-maltivec
+endif
+ifeq ($(CORE), PPC970)
+CCOMMON_OPT += -Wa,-mpwr4 -Wa,-maltivec
+endif
 endif
 endif
 # workaround for C->FORTRAN ABI violation in LAPACKE