target-ppc: VSX Stage 4: add xsrsqrtesp

This patch adds the VSX Scalar Reciprocal Square Root Estimate Single Precision (xsrsqrtesp) instruction. The existing VSX_RSQRTE() macro is modified to support rounding of the intermediate double-precision result to single precision. Signed-off-by: Tom Musta <tommusta@gmail.com> Reviewed-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Alexander Graf <agraf@suse.de>
qemu · Mar 5, 2014 · 968e76b · 968e76b
1 parent cea4e57
commit 968e76b
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Showing 3 changed files with 12 additions and 4 deletions.
diff --git a/target-ppc/fpu_helper.c b/target-ppc/fpu_helper.c
@@ -2018,7 +2018,7 @@ VSX_SQRT(xvsqrtsp, 4, float32, f32, 0, 0)
  *   fld   - vsr_t field (f32 or f64)
  *   sfprf - set FPRF
  */
-#define VSX_RSQRTE(op, nels, tp, fld, sfprf)                                 \
+#define VSX_RSQRTE(op, nels, tp, fld, sfprf, r2sp)                           \
 void helper_##op(CPUPPCState *env, uint32_t opcode)                          \
 {                                                                            \
     ppc_vsr_t xt, xb;                                                        \
@@ -2043,6 +2043,10 @@ void helper_##op(CPUPPCState *env, uint32_t opcode)                          \
             }                                                                \
         }                                                                    \
                                                                              \
+        if (r2sp) {                                                          \
+            xt.fld[i] = helper_frsp(env, xt.fld[i]);                         \
+        }                                                                    \
+                                                                             \
         if (sfprf) {                                                         \
             helper_compute_fprf(env, xt.fld[i], sfprf);                      \
         }                                                                    \
@@ -2052,9 +2056,10 @@ void helper_##op(CPUPPCState *env, uint32_t opcode)                          \
     helper_float_check_status(env);                                          \
 }
 
-VSX_RSQRTE(xsrsqrtedp, 1, float64, f64, 1)
-VSX_RSQRTE(xvrsqrtedp, 2, float64, f64, 0)
-VSX_RSQRTE(xvrsqrtesp, 4, float32, f32, 0)
+VSX_RSQRTE(xsrsqrtedp, 1, float64, f64, 1, 0)
+VSX_RSQRTE(xsrsqrtesp, 1, float64, f64, 1, 1)
+VSX_RSQRTE(xvrsqrtedp, 2, float64, f64, 0, 0)
+VSX_RSQRTE(xvrsqrtesp, 4, float32, f32, 0, 0)
 
 static inline int ppc_float32_get_unbiased_exp(float32 f)
 {

diff --git a/target-ppc/helper.h b/target-ppc/helper.h
@@ -292,6 +292,7 @@ DEF_HELPER_2(xsmulsp, void, env, i32)
 DEF_HELPER_2(xsdivsp, void, env, i32)
 DEF_HELPER_2(xsresp, void, env, i32)
 DEF_HELPER_2(xssqrtsp, void, env, i32)
+DEF_HELPER_2(xsrsqrtesp, void, env, i32)
 
 DEF_HELPER_2(xvadddp, void, env, i32)
 DEF_HELPER_2(xvsubdp, void, env, i32)

diff --git a/target-ppc/translate.c b/target-ppc/translate.c
@@ -7364,6 +7364,7 @@ GEN_VSX_HELPER_2(xsmulsp, 0x00, 0x02, 0, PPC2_VSX207)
 GEN_VSX_HELPER_2(xsdivsp, 0x00, 0x03, 0, PPC2_VSX207)
 GEN_VSX_HELPER_2(xsresp, 0x14, 0x01, 0, PPC2_VSX207)
 GEN_VSX_HELPER_2(xssqrtsp, 0x16, 0x00, 0, PPC2_VSX207)
+GEN_VSX_HELPER_2(xsrsqrtesp, 0x14, 0x00, 0, PPC2_VSX207)
 
 GEN_VSX_HELPER_2(xvadddp, 0x00, 0x0C, 0, PPC2_VSX)
 GEN_VSX_HELPER_2(xvsubdp, 0x00, 0x0D, 0, PPC2_VSX)
@@ -10177,6 +10178,7 @@ GEN_XX3FORM(xsmulsp, 0x00, 0x02, PPC2_VSX207),
 GEN_XX3FORM(xsdivsp, 0x00, 0x03, PPC2_VSX207),
 GEN_XX2FORM(xsresp,  0x14, 0x01, PPC2_VSX207),
 GEN_XX2FORM(xssqrtsp,  0x16, 0x00, PPC2_VSX207),
+GEN_XX2FORM(xsrsqrtesp,  0x14, 0x00, PPC2_VSX207),
 
 GEN_XX3FORM(xvadddp, 0x00, 0x0C, PPC2_VSX),
 GEN_XX3FORM(xvsubdp, 0x00, 0x0D, PPC2_VSX),