[Qemu-devel] [PATCH V3 17/19] Add VSX Floating Point to Floating Point Conversion Instructions

[Tom Musta <tommusta@gmail.com>]

This patch adds the VSX instructions that convert between floating
point formats: xscvdpsp, xscvspdp, xvcvdpsp, xvcvspdp.

Signed-off-by: Tom Musta <tommusta@gmail.com>
---
 target-ppc/fpu_helper.c |   46 ++++++++++++++++++++++++++++++++++++++++++++++
 target-ppc/helper.h     |    4 ++++
 target-ppc/translate.c  |    8 ++++++++
 3 files changed, 58 insertions(+), 0 deletions(-)

diff --git a/target-ppc/fpu_helper.c b/target-ppc/fpu_helper.c
index ec1df4f..c9fb59f 100644
--- a/target-ppc/fpu_helper.c
+++ b/target-ppc/fpu_helper.c
@@ -2395,3 +2395,49 @@ VSX_CMP(xvcmpgtdp, 2, float64, f64, lt, 1)
 VSX_CMP(xvcmpeqsp, 4, float32, f32, eq, 0)
 VSX_CMP(xvcmpgesp, 4, float32, f32, le, 1)
 VSX_CMP(xvcmpgtsp, 4, float32, f32, lt, 1)
+
+#if defined(HOST_WORDS_BIGENDIAN)
+#define JOFFSET 0
+#else
+#define JOFFSET 1
+#endif
+
+/* VSX_CVT_FP_TO_FP - VSX floating point/floating point conversion
+ *   op    - instruction mnemonic
+ *   nels  - number of elements (1, 2 or 4)
+ *   stp   - source type (float32 or float64)
+ *   ttp   - target type (float32 or float64)
+ *   sfld  - source vsr_t field
+ *   tfld  - target vsr_t field (f32 or f64)
+ *   sfprf - set FPRF
+ */
+#define VSX_CVT_FP_TO_FP(op, nels, stp, ttp, sfld, tfld, sfprf)    \
+void helper_##op(CPUPPCState *env, uint32_t opcode)                \
+{                                                                  \
+    ppc_vsr_t xt, xb;                                              \
+    int i;                                                         \
+                                                                   \
+    getVSR(xB(opcode), &xb, env);                                  \
+    getVSR(xT(opcode), &xt, env);                                  \
+                                                                   \
+    for (i = 0; i < nels; i++) {                                   \
+        int j = 2*i + JOFFSET;                                     \
+        xt.tfld = stp##_to_##ttp(xb.sfld, &env->fp_status);        \
+        if (unlikely(stp##_is_signaling_nan(xb.sfld))) {           \
+            fload_invalid_op_excp(env, POWERPC_EXCP_FP_VXSNAN, 0); \
+            xt.tfld = ttp##_snan_to_qnan(xt.tfld);                 \
+        }                                                          \
+        if (sfprf) {                                               \
+            helper_compute_fprf(env, ttp##_to_float64(xt.tfld,     \
+                                &env->fp_status), sfprf);          \
+        }                                                          \
+    }                                                              \
+                                                                   \
+    putVSR(xT(opcode), &xt, env);                                  \
+    helper_float_check_status(env);                                \
+}
+
+VSX_CVT_FP_TO_FP(xscvdpsp, 1, float64, float32, f64[i], f32[j], 1)
+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)
diff --git a/target-ppc/helper.h b/target-ppc/helper.h
index 35389c5..dd9518c 100644
--- a/target-ppc/helper.h
+++ b/target-ppc/helper.h
@@ -272,6 +272,8 @@ DEF_HELPER_2(xscmpodp, void, env, i32)
 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(xscvspdp, void, env, i32)
 
 DEF_HELPER_2(xvadddp, void, env, i32)
 DEF_HELPER_2(xvsubdp, void, env, i32)
@@ -295,6 +297,7 @@ DEF_HELPER_2(xvmindp, void, env, i32)
 DEF_HELPER_2(xvcmpeqdp, void, env, i32)
 DEF_HELPER_2(xvcmpgedp, void, env, i32)
 DEF_HELPER_2(xvcmpgtdp, void, env, i32)
+DEF_HELPER_2(xvcvdpsp, void, env, i32)
 
 DEF_HELPER_2(xvaddsp, void, env, i32)
 DEF_HELPER_2(xvsubsp, void, env, i32)
@@ -318,6 +321,7 @@ DEF_HELPER_2(xvminsp, void, env, i32)
 DEF_HELPER_2(xvcmpeqsp, void, env, i32)
 DEF_HELPER_2(xvcmpgesp, void, env, i32)
 DEF_HELPER_2(xvcmpgtsp, void, env, i32)
+DEF_HELPER_2(xvcvspdp, void, env, i32)
 
 DEF_HELPER_2(efscfsi, i32, env, i32)
 DEF_HELPER_2(efscfui, i32, env, i32)
diff --git a/target-ppc/translate.c b/target-ppc/translate.c
index 377a482..1366ced 100644
--- a/target-ppc/translate.c
+++ b/target-ppc/translate.c
@@ -7316,6 +7316,8 @@ GEN_VSX_HELPER_2(xscmpodp, 0x0C, 0x05, 0, PPC2_VSX)
 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_2(xscvspdp, 0x12, 0x14, 0, PPC2_VSX)
 
 GEN_VSX_HELPER_2(xvadddp, 0x00, 0x0C, 0, PPC2_VSX)
 GEN_VSX_HELPER_2(xvsubdp, 0x00, 0x0D, 0, PPC2_VSX)
@@ -7339,6 +7341,7 @@ GEN_VSX_HELPER_2(xvmindp, 0x00, 0x1D, 0, PPC2_VSX)
 GEN_VSX_HELPER_2(xvcmpeqdp, 0x0C, 0x0C, 0, PPC2_VSX)
 GEN_VSX_HELPER_2(xvcmpgtdp, 0x0C, 0x0D, 0, PPC2_VSX)
 GEN_VSX_HELPER_2(xvcmpgedp, 0x0C, 0x0E, 0, PPC2_VSX)
+GEN_VSX_HELPER_2(xvcvdpsp, 0x12, 0x18, 0, PPC2_VSX)
 
 GEN_VSX_HELPER_2(xvaddsp, 0x00, 0x08, 0, PPC2_VSX)
 GEN_VSX_HELPER_2(xvsubsp, 0x00, 0x09, 0, PPC2_VSX)
@@ -7362,6 +7365,7 @@ GEN_VSX_HELPER_2(xvminsp, 0x00, 0x19, 0, PPC2_VSX)
 GEN_VSX_HELPER_2(xvcmpeqsp, 0x0C, 0x08, 0, PPC2_VSX)
 GEN_VSX_HELPER_2(xvcmpgtsp, 0x0C, 0x09, 0, PPC2_VSX)
 GEN_VSX_HELPER_2(xvcmpgesp, 0x0C, 0x0A, 0, PPC2_VSX)
+GEN_VSX_HELPER_2(xvcvspdp, 0x12, 0x1C, 0, PPC2_VSX)
 
 #define VSX_LOGICAL(name, tcg_op)                                    \
 static void glue(gen_, name)(DisasContext * ctx)                     \
@@ -10077,6 +10081,8 @@ GEN_XX2FORM(xscmpodp,  0x0C, 0x05, PPC2_VSX),
 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(xscvspdp, 0x12, 0x14, PPC2_VSX),
 
 GEN_XX3FORM(xvadddp, 0x00, 0x0C, PPC2_VSX),
 GEN_XX3FORM(xvsubdp, 0x00, 0x0D, PPC2_VSX),
@@ -10100,6 +10106,7 @@ GEN_XX3FORM(xvmindp, 0x00, 0x1D, PPC2_VSX),
 GEN_XX3_RC_FORM(xvcmpeqdp, 0x0C, 0x0C, PPC2_VSX),
 GEN_XX3_RC_FORM(xvcmpgtdp, 0x0C, 0x0D, PPC2_VSX),
 GEN_XX3_RC_FORM(xvcmpgedp, 0x0C, 0x0E, PPC2_VSX),
+GEN_XX2FORM(xvcvdpsp, 0x12, 0x18, PPC2_VSX),
 
 GEN_XX3FORM(xvaddsp, 0x00, 0x08, PPC2_VSX),
 GEN_XX3FORM(xvsubsp, 0x00, 0x09, PPC2_VSX),
@@ -10123,6 +10130,7 @@ GEN_XX3FORM(xvminsp, 0x00, 0x19, PPC2_VSX),
 GEN_XX3_RC_FORM(xvcmpeqsp, 0x0C, 0x08, PPC2_VSX),
 GEN_XX3_RC_FORM(xvcmpgtsp, 0x0C, 0x09, PPC2_VSX),
 GEN_XX3_RC_FORM(xvcmpgesp, 0x0C, 0x0A, PPC2_VSX),
+GEN_XX2FORM(xvcvspdp, 0x12, 0x1C, PPC2_VSX),
 
 #undef VSX_LOGICAL
 #define VSX_LOGICAL(name, opc2, opc3, fl2) \
-- 
1.7.1