diff options
| author | Tom Musta <tommusta@gmail.com> | 2014-04-21 15:55:08 -0500 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2014-06-16 13:24:31 +0200 |
| commit | f3d2b0bce098456539ea16eb92af6197b68dc8d8 (patch) | |
| tree | f3542f94a05f8ae2ba0f0eef8ff02ba490da5164 /target-ppc | |
| parent | 1bf9c0e1339858505841117727cf10455171641f (diff) | |
| download | qemu-f3d2b0bce098456539ea16eb92af6197b68dc8d8.tar.gz | |
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.c | 32 | ||||
| -rw-r--r-- | target-ppc/helper.h | 2 | ||||
| -rw-r--r-- | target-ppc/translate.c | 4 |
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) |