Hexagon (target/hexagon) add F2_sfinvsqrta

Rd32,Pe4 = sfinvsqrta(Rs32)
    Square root approx

The helper packs the 2 32-bit results into a 64-bit value,
and the fGEN_TCG override unpacks them into the proper results.

Test cases in tests/tcg/hexagon/multi_result.c
FP exception tests added to tests/tcg/hexagon/fpstuff.c

Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <1617930474-31979-19-git-send-email-tsimpson@quicinc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

2 files changed, 44 insertions, 0 deletions

diff --git a/tests/tcg/hexagon/fpstuff.c b/tests/tcg/hexagon/fpstuff.c
index 8e3ba78..0dff429 100644
--- a/tests/tcg/hexagon/fpstuff.c
+++ b/tests/tcg/hexagon/fpstuff.c
@@ -441,6 +441,20 @@ static void check_canonical_NaN(void)
     check_fpstatus(usr, 0);
 }
 
+static void check_invsqrta(void)
+{
+    int result;
+    int predval;
+
+    asm volatile("%0,p0 = sfinvsqrta(%2)\n\t"
+                 "%1 = p0\n\t"
+                 : "+r"(result), "=r"(predval)
+                 : "r"(0x7f800000)
+                 : "p0");
+    check32(result, 0xff800000);
+    check32(predval, 0x0);
+}
+
 static void check_float2int_convs()
 {
     int res32;
@@ -590,6 +604,7 @@ int main()
     check_dfminmax();
     check_recip_exception();
     check_canonical_NaN();
+    check_invsqrta();
     check_float2int_convs();
 
     puts(err ? "FAIL" : "PASS");
diff --git a/tests/tcg/hexagon/multi_result.c b/tests/tcg/hexagon/multi_result.c
index cb7dd31..67aa462 100644
--- a/tests/tcg/hexagon/multi_result.c
+++ b/tests/tcg/hexagon/multi_result.c
@@ -31,6 +31,20 @@ static int sfrecipa(int Rs, int Rt, int *pred_result)
   return result;
 }
 
+static int sfinvsqrta(int Rs, int *pred_result)
+{
+  int result;
+  int predval;
+
+  asm volatile("%0,p0 = sfinvsqrta(%2)\n\t"
+               "%1 = p0\n\t"
+               : "+r"(result), "=r"(predval)
+               : "r"(Rs)
+               : "p0");
+  *pred_result = predval;
+  return result;
+}
+
 int err;
 
 static void check(int val, int expect)
@@ -59,9 +73,24 @@ static void test_sfrecipa()
     check_p(pred_result, 0x00);
 }
 
+static void test_sfinvsqrta()
+{
+    int res;
+    int pred_result;
+
+    res = sfinvsqrta(0x04030201, &pred_result);
+    check(res, 0x4d330000);
+    check_p(pred_result, 0xe0);
+
+    res = sfinvsqrta(0x0, &pred_result);
+    check(res, 0x3f800000);
+    check_p(pred_result, 0x0);
+}
+
 int main()
 {
     test_sfrecipa();
+    test_sfinvsqrta();
 
     puts(err ? "FAIL" : "PASS");
     return err;