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Re: [PATCH 6/7] target/ppc: use existing VsrD() macro to eliminate HI_ID
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From: |
Mark Cave-Ayland |
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Subject: |
Re: [PATCH 6/7] target/ppc: use existing VsrD() macro to eliminate HI_IDX and LO_IDX from dfp_helper.c |
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Date: |
Tue, 24 Sep 2019 22:44:04 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 |
On 24/09/2019 16:35, Mark Cave-Ayland wrote:
> Switch over all accesses to the decimal numbers held in struct PPC_DFP from
> using HI_IDX and LO_IDX to using the VsrD() macro instead. Not only does this
> allow the compiler to ensure that the various dfp_* functions are being passed
> a ppc_vsr_t rather than an arbitrary uint64_t pointer, but also allows the
> host endian-specific HI_IDX and LO_IDX to be completely removed from
> dfp_helper.c.
>
> Signed-off-by: Mark Cave-Ayland <address@hidden>
> ---
> target/ppc/dfp_helper.c | 70 ++++++++++++++++++-----------------------
> 1 file changed, 31 insertions(+), 39 deletions(-)
>
> diff --git a/target/ppc/dfp_helper.c b/target/ppc/dfp_helper.c
> index ed437f97da..c2d335e928 100644
> --- a/target/ppc/dfp_helper.c
> +++ b/target/ppc/dfp_helper.c
> @@ -28,13 +28,6 @@
> #include "libdecnumber/dpd/decimal64.h"
> #include "libdecnumber/dpd/decimal128.h"
>
> -#if defined(HOST_WORDS_BIGENDIAN)
> -#define HI_IDX 0
> -#define LO_IDX 1
> -#else
> -#define HI_IDX 1
> -#define LO_IDX 0
> -#endif
>
> static void get_dfp64(ppc_vsr_t *dst, ppc_fprp_t *dfp)
> {
> @@ -1039,31 +1032,31 @@ void helper_##op(CPUPPCState *env, ppc_fprp_t *t,
> ppc_fprp_t *b) \
> DFP_HELPER_CTFIX(dctfix, 64)
> DFP_HELPER_CTFIX(dctfixq, 128)
>
> -static inline void dfp_set_bcd_digit_64(uint64_t *t, uint8_t digit,
> - unsigned n)
> +static inline void dfp_set_bcd_digit_64(ppc_vsr_t *t, uint8_t digit,
> + unsigned n)
> {
> - *t |= ((uint64_t)(digit & 0xF) << (n << 2));
> + t->VsrD(1) |= ((uint64_t)(digit & 0xF) << (n << 2));
> }
>
> -static inline void dfp_set_bcd_digit_128(uint64_t *t, uint8_t digit,
> - unsigned n)
> +static inline void dfp_set_bcd_digit_128(ppc_vsr_t *t, uint8_t digit,
> + unsigned n)
> {
> - t[(n & 0x10) ? HI_IDX : LO_IDX] |=
> + t->VsrD((n & 0x10) ? 0 : 1) |=
> ((uint64_t)(digit & 0xF) << ((n & 15) << 2));
> }
>
> -static inline void dfp_set_sign_64(uint64_t *t, uint8_t sgn)
> +static inline void dfp_set_sign_64(ppc_vsr_t *t, uint8_t sgn)
> {
> - *t <<= 4;
> - *t |= (sgn & 0xF);
> + t->VsrD(1) <<= 4;
> + t->VsrD(1) |= (sgn & 0xF);
> }
>
> -static inline void dfp_set_sign_128(uint64_t *t, uint8_t sgn)
> +static inline void dfp_set_sign_128(ppc_vsr_t *t, uint8_t sgn)
> {
> - t[HI_IDX] <<= 4;
> - t[HI_IDX] |= (t[LO_IDX] >> 60);
> - t[LO_IDX] <<= 4;
> - t[LO_IDX] |= (sgn & 0xF);
> + t->VsrD(0) <<= 4;
> + t->VsrD(0) |= (t->VsrD(0) >> 60) ^^^^^^^^^^
I've just noticed that I've made a typo here: the line above should of course
read:
t->VsrD(0) |= (t->VsrD(1) >> 60);
> + t->VsrD(1) <<= 4;
> + t->VsrD(1) |= (sgn & 0xF);
> }
>
> #define DFP_HELPER_DEDPD(op, size) \
> @@ -1081,7 +1074,7 @@ void helper_##op(CPUPPCState *env, ppc_fprp_t *t,
> ppc_fprp_t *b, \
> N = dfp.b.digits; \
> \
> for (i = 0; (i < N) && (i < (size)/4); i++) { \
> - dfp_set_bcd_digit_##size(&dfp.vt.u64[0], digits[N - i - 1], i); \
> + dfp_set_bcd_digit_##size(&dfp.vt, digits[N - i - 1], i); \
> } \
> \
> if (sp & 2) { \
> @@ -1092,7 +1085,7 @@ void helper_##op(CPUPPCState *env, ppc_fprp_t *t,
> ppc_fprp_t *b, \
> } else { \
> sgn = ((sp & 1) ? 0xF : 0xC); \
> } \
> - dfp_set_sign_##size(&dfp.vt.u64[0], sgn); \
> + dfp_set_sign_##size(&dfp.vt, sgn); \
> } \
> \
> if (size == 64) { \
> @@ -1105,14 +1098,14 @@ void helper_##op(CPUPPCState *env, ppc_fprp_t *t,
> ppc_fprp_t *b, \
> DFP_HELPER_DEDPD(ddedpd, 64)
> DFP_HELPER_DEDPD(ddedpdq, 128)
>
> -static inline uint8_t dfp_get_bcd_digit_64(uint64_t *t, unsigned n)
> +static inline uint8_t dfp_get_bcd_digit_64(ppc_vsr_t *t, unsigned n)
> {
> - return *t >> ((n << 2) & 63) & 15;
> + return t->VsrD(1) >> ((n << 2) & 63) & 15;
> }
>
> -static inline uint8_t dfp_get_bcd_digit_128(uint64_t *t, unsigned n)
> +static inline uint8_t dfp_get_bcd_digit_128(ppc_vsr_t *t, unsigned n)
> {
> - return t[(n & 0x10) ? HI_IDX : LO_IDX] >> ((n << 2) & 63) & 15;
> + return t->VsrD((n & 0x10) ? 0 : 1) >> ((n << 2) & 63) & 15;
> }
>
> #define DFP_HELPER_ENBCD(op, size)
> \
> @@ -1128,8 +1121,7 @@ void helper_##op(CPUPPCState *env, ppc_fprp_t *t,
> ppc_fprp_t *b, \
> decNumberZero(&dfp.t);
> \
>
> \
> if (s) {
> \
> - uint8_t sgnNibble = dfp_get_bcd_digit_##size(&dfp.vb.u64[0],
> \
> - offset++);
> \
> + uint8_t sgnNibble = dfp_get_bcd_digit_##size(&dfp.vb, offset++);
> \
> switch (sgnNibble) {
> \
> case 0xD:
> \
> case 0xB:
> \
> @@ -1149,7 +1141,7 @@ void helper_##op(CPUPPCState *env, ppc_fprp_t *t,
> ppc_fprp_t *b, \
>
> \
> while (offset < (size) / 4) {
> \
> n++;
> \
> - digits[(size) / 4 - n] = dfp_get_bcd_digit_##size(&dfp.vb.u64[0],
> \
> + digits[(size) / 4 - n] = dfp_get_bcd_digit_##size(&dfp.vb,
> \
> offset++);
> \
> if (digits[(size) / 4 - n] > 10) {
> \
> dfp_set_FPSCR_flag(&dfp, FP_VX | FP_VXCVI, FPSCR_VE);
> \
> @@ -1212,16 +1204,16 @@ void helper_##op(CPUPPCState *env, ppc_fprp_t *t,
> ppc_fprp_t *b) \
> DFP_HELPER_XEX(dxex, 64)
> DFP_HELPER_XEX(dxexq, 128)
>
> -static void dfp_set_raw_exp_64(uint64_t *t, uint64_t raw)
> +static void dfp_set_raw_exp_64(ppc_vsr_t *t, uint64_t raw)
> {
> - *t &= 0x8003ffffffffffffULL;
> - *t |= (raw << (63 - 13));
> + t->VsrD(1) &= 0x8003ffffffffffffULL;
> + t->VsrD(1) |= (raw << (63 - 13));
> }
>
> -static void dfp_set_raw_exp_128(uint64_t *t, uint64_t raw)
> +static void dfp_set_raw_exp_128(ppc_vsr_t *t, uint64_t raw)
> {
> - t[HI_IDX] &= 0x80003fffffffffffULL;
> - t[HI_IDX] |= (raw << (63 - 17));
> + t->VsrD(0) &= 0x80003fffffffffffULL;
> + t->VsrD(0) |= (raw << (63 - 17));
> }
>
> #define DFP_HELPER_IEX(op, size) \
> @@ -1258,11 +1250,11 @@ void helper_##op(CPUPPCState *env, ppc_fprp_t *t,
> ppc_fprp_t *a, \
> dfp.vt.VsrD(0) = dfp.vb.VsrD(0); \
> dfp.vt.VsrD(1) = dfp.vb.VsrD(1); \
> if (exp == -1) { \
> - dfp_set_raw_exp_##size(&dfp.vt.u64[0], raw_inf); \
> + dfp_set_raw_exp_##size(&dfp.vt, raw_inf); \
> } else if (exp == -3) { \
> - dfp_set_raw_exp_##size(&dfp.vt.u64[0], raw_snan); \
> + dfp_set_raw_exp_##size(&dfp.vt, raw_snan); \
> } else { \
> - dfp_set_raw_exp_##size(&dfp.vt.u64[0], raw_qnan); \
> + dfp_set_raw_exp_##size(&dfp.vt, raw_qnan); \
> } \
> } else { \
> dfp.t = dfp.b; \
ATB,
Mark.
- [PATCH 0/7] target/ppc: DFP fixes and improvements, Mark Cave-Ayland, 2019/09/24
- [PATCH 2/7] target/ppc: introduce set_dfp{64,128}() helper functions, Mark Cave-Ayland, 2019/09/24
- [PATCH 3/7] target/ppc: update {get, set}_dfp{64, 128}() helper functions to read/write DFP numbers correctly, Mark Cave-Ayland, 2019/09/24
- [PATCH 6/7] target/ppc: use existing VsrD() macro to eliminate HI_IDX and LO_IDX from dfp_helper.c, Mark Cave-Ayland, 2019/09/24
[PATCH 4/7] target/ppc: introduce dfp_finalize_decimal{64, 128}() helper functions, Mark Cave-Ayland, 2019/09/24
[PATCH 5/7] target/ppc: change struct PPC_DFP decimal storage from uint64[2] to ppc_vsr_t, Mark Cave-Ayland, 2019/09/24
[PATCH 7/7] target/ppc: remove unnecessary if() around calls to set_dfp{64, 128}() in DFP macros, Mark Cave-Ayland, 2019/09/24