target/arm: Fix SME full tile indexing

For the outer product set of insns, which take an entire matrix
tile as output, the argument is not a combined tile+column.
Therefore using get_tile_rowcol was incorrect, as we extracted
the tile number from itself.

The test case relies only on assembler support for SME, since
no release of GCC recognizes -march=armv9-a+sme yet.

Cc: qemu-stable@nongnu.org
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1620
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20230622151201.1578522-5-richard.henderson@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
[PMM: dropped now-unneeded changes to sysregs CFLAGS]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

2 files changed, 89 insertions, 1 deletions

diff --git a/tests/tcg/aarch64/Makefile.target b/tests/tcg/aarch64/Makefile.target
index ea9ceb3..0606dec 100644
--- a/tests/tcg/aarch64/Makefile.target
+++ b/tests/tcg/aarch64/Makefile.target
@@ -26,7 +26,7 @@ config-cc.mak: Makefile
 	    $(call cc-option,-march=armv8.5-a,              CROSS_CC_HAS_ARMV8_5); \
 	    $(call cc-option,-mbranch-protection=standard,  CROSS_CC_HAS_ARMV8_BTI); \
 	    $(call cc-option,-march=armv8.5-a+memtag,       CROSS_CC_HAS_ARMV8_MTE); \
-	    $(call cc-option,-march=armv9-a+sme,            CROSS_CC_HAS_ARMV9_SME)) 3> config-cc.mak
+	    $(call cc-option,-Wa$(COMMA)-march=armv9-a+sme, CROSS_AS_HAS_ARMV9_SME)) 3> config-cc.mak
 -include config-cc.mak
 
 ifneq ($(CROSS_CC_HAS_ARMV8_2),)
@@ -61,6 +61,11 @@ AARCH64_TESTS += mte-1 mte-2 mte-3 mte-4 mte-5 mte-6 mte-7
 mte-%: CFLAGS += -march=armv8.5-a+memtag
 endif
 
+# SME Tests
+ifneq ($(CROSS_AS_HAS_ARMV9_SME),)
+AARCH64_TESTS += sme-outprod1
+endif
+
 # System Registers Tests
 AARCH64_TESTS += sysregs
 
diff --git a/tests/tcg/aarch64/sme-outprod1.c b/tests/tcg/aarch64/sme-outprod1.c
new file mode 100644
index 0000000..6e5972d
--- /dev/null
+++ b/tests/tcg/aarch64/sme-outprod1.c
@@ -0,0 +1,83 @@
+/*
+ * SME outer product, 1 x 1.
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include <stdio.h>
+
+extern void foo(float *dst);
+
+asm(
+"	.arch_extension sme\n"
+"	.type foo, @function\n"
+"foo:\n"
+"	stp x29, x30, [sp, -80]!\n"
+"	mov x29, sp\n"
+"	stp d8, d9, [sp, 16]\n"
+"	stp d10, d11, [sp, 32]\n"
+"	stp d12, d13, [sp, 48]\n"
+"	stp d14, d15, [sp, 64]\n"
+"	smstart\n"
+"	ptrue p0.s, vl4\n"
+"	fmov z0.s, #1.0\n"
+/*
+ * An outer product of a vector of 1.0 by itself should be a matrix of 1.0.
+ * Note that we are using tile 1 here (za1.s) rather than tile 0.
+ */
+"	zero {za}\n"
+"	fmopa za1.s, p0/m, p0/m, z0.s, z0.s\n"
+/*
+ * Read the first 4x4 sub-matrix of elements from tile 1:
+ * Note that za1h should be interchangable here.
+ */
+"	mov w12, #0\n"
+"	mova z0.s, p0/m, za1v.s[w12, #0]\n"
+"	mova z1.s, p0/m, za1v.s[w12, #1]\n"
+"	mova z2.s, p0/m, za1v.s[w12, #2]\n"
+"	mova z3.s, p0/m, za1v.s[w12, #3]\n"
+/*
+ * And store them to the input pointer (dst in the C code):
+ */
+"	st1w {z0.s}, p0, [x0]\n"
+"	add x0, x0, #16\n"
+"	st1w {z1.s}, p0, [x0]\n"
+"	add x0, x0, #16\n"
+"	st1w {z2.s}, p0, [x0]\n"
+"	add x0, x0, #16\n"
+"	st1w {z3.s}, p0, [x0]\n"
+"	smstop\n"
+"	ldp d8, d9, [sp, 16]\n"
+"	ldp d10, d11, [sp, 32]\n"
+"	ldp d12, d13, [sp, 48]\n"
+"	ldp d14, d15, [sp, 64]\n"
+"	ldp x29, x30, [sp], 80\n"
+"	ret\n"
+"	.size foo, . - foo"
+);
+
+int main()
+{
+    float dst[16];
+    int i, j;
+
+    foo(dst);
+
+    for (i = 0; i < 16; i++) {
+        if (dst[i] != 1.0f) {
+            break;
+        }
+    }
+
+    if (i == 16) {
+        return 0; /* success */
+    }
+
+    /* failure */
+    for (i = 0; i < 4; ++i) {
+        for (j = 0; j < 4; ++j) {
+            printf("%f ", (double)dst[i * 4 + j]);
+        }
+        printf("\n");
+    }
+    return 1;
+}