tests/tcg/loongarch64: Add fp comparison instructions test

Choose some instructions to test:
- FCMP.cond.S
- cond: ceq clt cle cne seq slt sle sne
Signed-off-by: NSong Gao <gaosong@loongson.cn>
Message-Id: <20220716085426.3098060-8-gaosong@loongson.cn>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

tests/tcg/loongarch64/Makefile.target

@@ -13,5 +13,6 @@ LDFLAGS+=-lm
 LOONGARCH64_TESTS  = test_bit
 LOONGARCH64_TESTS  += test_div
 LOONGARCH64_TESTS  += test_fclass
+LOONGARCH64_TESTS  += test_fpcom
 
 TESTS += $(LOONGARCH64_TESTS)

tests/tcg/loongarch64/test_fpcom.c

+#include <assert.h>
+
+#define TEST_COMP(N)                              \
+void test_##N(float fj, float fk)                 \
+{                                                 \
+    int rd = 0;                                   \
+                                                  \
+    asm volatile("fcmp."#N".s $fcc6,%1,%2\n"      \
+                 "movcf2gr %0, $fcc6\n"           \
+                 : "=r"(rd)                       \
+                 : "f"(fj), "f"(fk)               \
+                 : );                             \
+    assert(rd == 1);                              \
+}
+
+TEST_COMP(ceq)
+TEST_COMP(clt)
+TEST_COMP(cle)
+TEST_COMP(cne)
+TEST_COMP(seq)
+TEST_COMP(slt)
+TEST_COMP(sle)
+TEST_COMP(sne)
+
+int main()
+{
+    test_ceq(0xff700102, 0xff700102);
+    test_clt(0x00730007, 0xff730007);
+    test_cle(0xff70130a, 0xff70130b);
+    test_cne(0x1238acde, 0xff71111f);
+    test_seq(0xff766618, 0xff766619);
+    test_slt(0xff78881c, 0xff78901d);
+    test_sle(0xff780b22, 0xff790b22);
+    test_sne(0xff7bcd25, 0xff7a26cf);
+
+    return 0;
+}