[Qemu-devel] [PATCH 09/14] VSX Stage 4: Add xsresp

[Tom Musta <tommusta@gmail.com>]

This patch adds the VSX Scalar Reciprocal Estimate Single Precision
(xsresp) instruction.

The existing VSX_RE macro is modified to support rounding of the
intermediate double precision result to single precision.

Signed-off-by: Tom Musta <tommusta@gmail.com>
---
 target-ppc/fpu_helper.c |   15 +++++++++++----
 target-ppc/helper.h     |    1 +
 target-ppc/translate.c  |    2 ++
 3 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/target-ppc/fpu_helper.c b/target-ppc/fpu_helper.c
index 1133591..862f855 100644
--- a/target-ppc/fpu_helper.c
+++ b/target-ppc/fpu_helper.c
@@ -1931,7 +1931,7 @@ VSX_DIV(xvdivsp, 4, float32, f32, 0, 0)
  *   fld   - vsr_t field (f32 or f64)
  *   sfprf - set FPRF
  */
-#define VSX_RE(op, nels, tp, fld, sfprf)                                      \
+#define VSX_RE(op, nels, tp, fld, sfprf, r2sp)                                \
 void helper_##op(CPUPPCState *env, uint32_t opcode)                           \
 {                                                                             \
     ppc_vsr_t xt, xb;                                                         \
@@ -1946,6 +1946,12 @@ void helper_##op(CPUPPCState *env, uint32_t opcode)                           \
                 fload_invalid_op_excp(env, POWERPC_EXCP_FP_VXSNAN, sfprf);    \
         }                                                                     \
         xt.fld[i] = tp##_div(tp##_one, xb.fld[i], &env->fp_status);           \
+                                                                              \
+        if (r2sp) {                                                           \
+            float32 tmp32 = float64_to_float32(xt.fld[i], &env->fp_status);   \
+            xt.fld[i] = float32_to_float64(tmp32, &env->fp_status);           \
+        }                                                                     \
+                                                                              \
         if (sfprf) {                                                          \
             helper_compute_fprf(env, xt.fld[0], sfprf);                       \
         }                                                                     \
@@ -1955,9 +1961,10 @@ void helper_##op(CPUPPCState *env, uint32_t opcode)                           \
     helper_float_check_status(env);                                           \
 }
 
-VSX_RE(xsredp, 1, float64, f64, 1)
-VSX_RE(xvredp, 2, float64, f64, 0)
-VSX_RE(xvresp, 4, float32, f32, 0)
+VSX_RE(xsredp, 1, float64, f64, 1, 0)
+VSX_RE(xsresp, 1, float64, f64, 1, 1)
+VSX_RE(xvredp, 2, float64, f64, 0, 0)
+VSX_RE(xvresp, 4, float32, f32, 0, 0)
 
 /* VSX_SQRT - VSX floating point square root
  *   op    - instruction mnemonic
diff --git a/target-ppc/helper.h b/target-ppc/helper.h
index 308f97c..b1cf3c0 100644
--- a/target-ppc/helper.h
+++ b/target-ppc/helper.h
@@ -290,6 +290,7 @@ DEF_HELPER_2(xsaddsp, void, env, i32)
 DEF_HELPER_2(xssubsp, void, env, i32)
 DEF_HELPER_2(xsmulsp, void, env, i32)
 DEF_HELPER_2(xsdivsp, void, env, i32)
+DEF_HELPER_2(xsresp, 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
index 896dbc2..c4c57a1 100644
--- a/target-ppc/translate.c
+++ b/target-ppc/translate.c
@@ -7345,6 +7345,7 @@ GEN_VSX_HELPER_2(xsaddsp, 0x00, 0x00, 0, PPC2_VSX207)
 GEN_VSX_HELPER_2(xssubsp, 0x00, 0x01, 0, PPC2_VSX207)
 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(xvadddp, 0x00, 0x0C, 0, PPC2_VSX)
 GEN_VSX_HELPER_2(xvsubdp, 0x00, 0x0D, 0, PPC2_VSX)
@@ -10157,6 +10158,7 @@ GEN_XX3FORM(xsaddsp, 0x00, 0x00, PPC2_VSX207),
 GEN_XX3FORM(xssubsp, 0x00, 0x01, PPC2_VSX207),
 GEN_XX3FORM(xsmulsp, 0x00, 0x02, PPC2_VSX207),
 GEN_XX3FORM(xsdivsp, 0x00, 0x03, PPC2_VSX207),
+GEN_XX2FORM(xsresp,  0x14, 0x01, PPC2_VSX207),
 
 GEN_XX3FORM(xvadddp, 0x00, 0x0C, PPC2_VSX),
 GEN_XX3FORM(xvsubdp, 0x00, 0x0D, PPC2_VSX),
-- 
1.7.1