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authorTom Musta <tommusta@gmail.com>2014-04-21 15:55:08 -0500
committerAlexander Graf <agraf@suse.de>2014-06-16 13:24:31 +0200
commitf3d2b0bce098456539ea16eb92af6197b68dc8d8 (patch)
treef3542f94a05f8ae2ba0f0eef8ff02ba490da5164 /target-ppc
parent1bf9c0e1339858505841117727cf10455171641f (diff)
target-ppc: Introduce DFP Test Exponent
Add emulation of the PowerPC Decimal Floating Point Test Exponent instructions dtstex[q][.]. Signed-off-by: Tom Musta <tommusta@gmail.com> Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'target-ppc')
-rw-r--r--target-ppc/dfp_helper.c32
-rw-r--r--target-ppc/helper.h2
-rw-r--r--target-ppc/translate.c4
3 files changed, 38 insertions, 0 deletions
diff --git a/target-ppc/dfp_helper.c b/target-ppc/dfp_helper.c
index 7f18fd9890..43eb70d964 100644
--- a/target-ppc/dfp_helper.c
+++ b/target-ppc/dfp_helper.c
@@ -504,3 +504,35 @@ uint32_t helper_##op(CPUPPCState *env, uint64_t *a, uint32_t dcm) \
DFP_HELPER_TSTDG(dtstdg, 64)
DFP_HELPER_TSTDG(dtstdgq, 128)
+
+#define DFP_HELPER_TSTEX(op, size) \
+uint32_t helper_##op(CPUPPCState *env, uint64_t *a, uint64_t *b) \
+{ \
+ struct PPC_DFP dfp; \
+ int expa, expb, a_is_special, b_is_special; \
+ \
+ dfp_prepare_decimal##size(&dfp, a, b, env); \
+ \
+ expa = dfp.a.exponent; \
+ expb = dfp.b.exponent; \
+ a_is_special = decNumberIsSpecial(&dfp.a); \
+ b_is_special = decNumberIsSpecial(&dfp.b); \
+ \
+ if (a_is_special || b_is_special) { \
+ int atype = a_is_special ? (decNumberIsNaN(&dfp.a) ? 4 : 2) : 1; \
+ int btype = b_is_special ? (decNumberIsNaN(&dfp.b) ? 4 : 2) : 1; \
+ dfp.crbf = (atype ^ btype) ? 0x1 : 0x2; \
+ } else if (expa < expb) { \
+ dfp.crbf = 0x8; \
+ } else if (expa > expb) { \
+ dfp.crbf = 0x4; \
+ } else { \
+ dfp.crbf = 0x2; \
+ } \
+ \
+ dfp_set_FPCC_from_CRBF(&dfp); \
+ return dfp.crbf; \
+}
+
+DFP_HELPER_TSTEX(dtstex, 64)
+DFP_HELPER_TSTEX(dtstexq, 128)
diff --git a/target-ppc/helper.h b/target-ppc/helper.h
index dad4b87e52..8ffb80651b 100644
--- a/target-ppc/helper.h
+++ b/target-ppc/helper.h
@@ -632,3 +632,5 @@ DEF_HELPER_3(dtstdc, i32, env, fprp, i32)
DEF_HELPER_3(dtstdcq, i32, env, fprp, i32)
DEF_HELPER_3(dtstdg, i32, env, fprp, i32)
DEF_HELPER_3(dtstdgq, i32, env, fprp, i32)
+DEF_HELPER_3(dtstex, i32, env, fprp, fprp)
+DEF_HELPER_3(dtstexq, i32, env, fprp, fprp)
diff --git a/target-ppc/translate.c b/target-ppc/translate.c
index 79b8bb269b..373e8ea587 100644
--- a/target-ppc/translate.c
+++ b/target-ppc/translate.c
@@ -8372,6 +8372,8 @@ GEN_DFP_BF_A_DCM(dtstdc)
GEN_DFP_BF_A_DCM(dtstdcq)
GEN_DFP_BF_A_DCM(dtstdg)
GEN_DFP_BF_A_DCM(dtstdgq)
+GEN_DFP_BF_A_B(dtstex)
+GEN_DFP_BF_A_B(dtstexq)
/*** SPE extension ***/
/* Register moves */
@@ -11315,6 +11317,8 @@ GEN_DFP_BF_A_DCM(dtstdc, 0x02, 0x06),
GEN_DFP_BF_Ap_DCM(dtstdcq, 0x02, 0x06),
GEN_DFP_BF_A_DCM(dtstdg, 0x02, 0x07),
GEN_DFP_BF_Ap_DCM(dtstdgq, 0x02, 0x07),
+GEN_DFP_BF_A_B(dtstex, 0x02, 0x05),
+GEN_DFP_BF_Ap_Bp(dtstexq, 0x02, 0x05),
#undef GEN_SPE
#define GEN_SPE(name0, name1, opc2, opc3, inval0, inval1, type) \
GEN_OPCODE_DUAL(name0##_##name1, 0x04, opc2, opc3, inval0, inval1, type, PPC_NONE)