[PULL 21/23] tests/tcg/mips: cover Octeon QMAC instructions

["Philippe Mathieu-Daudé" <philmd@oss.qualcomm.com>]

From: James Hilliard <james.hilliard1@gmail.com>

Add smoke coverage for Octeon QMAC and QMACS fixed-point accumulator
instruction paths.

The coverage exercises normal accumulation, saturating accumulation, and
the sticky saturation flag.

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20260608-mips-octeon-missing-insns-v2-v16-21-daef7a0d8b04@gmail.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com>
---
 tests/tcg/mips/user/isa/octeon/octeon-insns.c | 40 +++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/tests/tcg/mips/user/isa/octeon/octeon-insns.c b/tests/tcg/mips/user/isa/octeon/octeon-insns.c
index 6480c8532a1..6fffc820103 100644
--- a/tests/tcg/mips/user/isa/octeon/octeon-insns.c
+++ b/tests/tcg/mips/user/isa/octeon/octeon-insns.c
@@ -129,6 +129,43 @@ static uint64_t octeon_vmm0(uint64_t mpl0, uint64_t p0,
     return rd;
 }
 
+static uint64_t octeon_qmac_lo(uint64_t rs, uint64_t rt, uint64_t lo)
+{
+    uint64_t rd;
+
+    asm volatile(
+        "move $8, %[rs]\n\t"
+        "move $9, %[rt]\n\t"
+        "mtlo %[lo]\n\t"
+        "mthi $0\n\t"
+        ".word 0x710904d2\n\t" /* qmac.03 $8, $9 */
+        "mflo %[rd]\n\t"
+        : [rd] "=r" (rd)
+        : [rs] "r" (rs), [rt] "r" (rt), [lo] "r" (lo)
+        : "$8", "$9");
+
+    return rd;
+}
+
+static uint64_t octeon_qmacs_state(uint64_t rs, uint64_t rt, uint64_t lo)
+{
+    uint64_t hi, rd;
+
+    asm volatile(
+        "move $8, %[rs]\n\t"
+        "move $9, %[rt]\n\t"
+        "mtlo %[lo]\n\t"
+        "mthi $0\n\t"
+        ".word 0x71090012\n\t" /* qmacs.00 $8, $9 */
+        "mfhi %[hi]\n\t"
+        "mflo %[rd]\n\t"
+        : [hi] "=r" (hi), [rd] "=r" (rd)
+        : [rs] "r" (rs), [rt] "r" (rt), [lo] "r" (lo)
+        : "$8", "$9");
+
+    return ((hi & 1) << 32) | (rd & 0xffffffff);
+}
+
 static uint64_t octeon_vmm0_zeroes_mpl1(void)
 {
     uint64_t rd;
@@ -355,6 +392,9 @@ int main(void)
     assert(octeon_seq(0xabc, 0xdef) == 0);
     assert(octeon_sne(0xabc, 0xabc) == 0);
     assert(octeon_sne(0xabc, 0xdef) == 1);
+    assert(octeon_qmac_lo(0x0003000000000000ULL, 2, 1) == 13);
+    assert(octeon_qmacs_state(1, 1, 0x7ffffffe) == 0x17fffffffULL);
+    assert(octeon_qmacs_state(0x8000, 0x8000, 0) == 0x17fffffffULL);
     assert(octeon_vmulu(5, 7, 11) == 46);
     assert(octeon_vmm0(5, 13, 7, 11) == 59);
     assert(octeon_vmm0_zeroes_mpl1() == 0);
-- 
2.53.0