[Qemu-devel] [V7 PATCH 18/18] target-ppc: Scalar Non-Signalling Conversions

[Tom Musta <tommusta@gmail.com>]

This patch adds the non-signalling scalar conversion instructions:

  - VSX Scalar Convert Single Precision to Double Precision
    Non-Signalling (xscvspdpn)
  - VSX Scalar Convert Double Precision to Single Precision
    Non-Signalling (xscvdpspn)

Signed-off-by: Tom Musta <tommusta@gmail.com>
---
V6: New.

V7: Adjusted helper signatures per Richard Henderson's review.

 target-ppc/fpu_helper.c |   16 ++++++++++++++++
 target-ppc/helper.h     |    2 ++
 target-ppc/translate.c  |    4 ++++
 3 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/target-ppc/fpu_helper.c b/target-ppc/fpu_helper.c
index c35135e..dfd9b80 100644
--- a/target-ppc/fpu_helper.c
+++ b/target-ppc/fpu_helper.c
@@ -2487,6 +2487,22 @@ VSX_CVT_FP_TO_FP(xscvspdp, 1, float32, float64, f32[j], f64[i], 1)
 VSX_CVT_FP_TO_FP(xvcvdpsp, 2, float64, float32, f64[i], f32[j], 0)
 VSX_CVT_FP_TO_FP(xvcvspdp, 2, float32, float64, f32[j], f64[i], 0)
 
+uint64_t helper_xscvdpspn(CPUPPCState *env, uint64_t xb)
+{
+    float_status tstat = env->fp_status;
+    set_float_exception_flags(0, &tstat);
+
+    return (uint64_t)float64_to_float32(xb, &tstat) << 32;
+}
+
+uint64_t helper_xscvspdpn(CPUPPCState *env, uint64_t xb)
+{
+    float_status tstat = env->fp_status;
+    set_float_exception_flags(0, &tstat);
+
+    return float32_to_float64(xb >> 32, &tstat);
+}
+
 /* VSX_CVT_FP_TO_INT - VSX floating point to integer conversion
  *   op    - instruction mnemonic
  *   nels  - number of elements (1, 2 or 4)
diff --git a/target-ppc/helper.h b/target-ppc/helper.h
index 1654589..0976930 100644
--- a/target-ppc/helper.h
+++ b/target-ppc/helper.h
@@ -273,7 +273,9 @@ DEF_HELPER_2(xscmpudp, void, env, i32)
 DEF_HELPER_2(xsmaxdp, void, env, i32)
 DEF_HELPER_2(xsmindp, void, env, i32)
 DEF_HELPER_2(xscvdpsp, void, env, i32)
+DEF_HELPER_2(xscvdpspn, i64, env, i64)
 DEF_HELPER_2(xscvspdp, void, env, i32)
+DEF_HELPER_2(xscvspdpn, i64, env, i64)
 DEF_HELPER_2(xscvdpsxds, void, env, i32)
 DEF_HELPER_2(xscvdpsxws, void, env, i32)
 DEF_HELPER_2(xscvdpuxds, void, env, i32)
diff --git a/target-ppc/translate.c b/target-ppc/translate.c
index 2c9b50a..6ebc696 100644
--- a/target-ppc/translate.c
+++ b/target-ppc/translate.c
@@ -7437,7 +7437,9 @@ GEN_VSX_HELPER_2(xscmpudp, 0x0C, 0x04, 0, PPC2_VSX)
 GEN_VSX_HELPER_2(xsmaxdp, 0x00, 0x14, 0, PPC2_VSX)
 GEN_VSX_HELPER_2(xsmindp, 0x00, 0x15, 0, PPC2_VSX)
 GEN_VSX_HELPER_2(xscvdpsp, 0x12, 0x10, 0, PPC2_VSX)
+GEN_VSX_HELPER_XT_XB_ENV(xscvdpspn, 0x16, 0x10, 0, PPC2_VSX207)
 GEN_VSX_HELPER_2(xscvspdp, 0x12, 0x14, 0, PPC2_VSX)
+GEN_VSX_HELPER_XT_XB_ENV(xscvspdpn, 0x16, 0x14, 0, PPC2_VSX207)
 GEN_VSX_HELPER_2(xscvdpsxds, 0x10, 0x15, 0, PPC2_VSX)
 GEN_VSX_HELPER_2(xscvdpsxws, 0x10, 0x05, 0, PPC2_VSX)
 GEN_VSX_HELPER_2(xscvdpuxds, 0x10, 0x14, 0, PPC2_VSX)
@@ -10275,7 +10277,9 @@ GEN_XX2FORM(xscmpudp,  0x0C, 0x04, PPC2_VSX),
 GEN_XX3FORM(xsmaxdp, 0x00, 0x14, PPC2_VSX),
 GEN_XX3FORM(xsmindp, 0x00, 0x15, PPC2_VSX),
 GEN_XX2FORM(xscvdpsp, 0x12, 0x10, PPC2_VSX),
+GEN_XX2FORM(xscvdpspn, 0x16, 0x10, PPC2_VSX207),
 GEN_XX2FORM(xscvspdp, 0x12, 0x14, PPC2_VSX),
+GEN_XX2FORM(xscvspdpn, 0x16, 0x14, PPC2_VSX207),
 GEN_XX2FORM(xscvdpsxds, 0x10, 0x15, PPC2_VSX),
 GEN_XX2FORM(xscvdpsxws, 0x10, 0x05, PPC2_VSX),
 GEN_XX2FORM(xscvdpuxds, 0x10, 0x14, PPC2_VSX),
-- 
1.7.1