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[PATCH 28/35] target/ppc: Add helpers for fmadds et al
From: |
Richard Henderson |
Subject: |
[PATCH 28/35] target/ppc: Add helpers for fmadds et al |
Date: |
Fri, 19 Nov 2021 17:04:55 +0100 |
Use float64r32_muladd. Fixes a double-rounding issue with performing
the compuation in float64 and then rounding afterward.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
target/ppc/helper.h | 4 ++++
target/ppc/fpu_helper.c | 17 ++++++++++++++++-
target/ppc/translate/fp-impl.c.inc | 13 +++++--------
3 files changed, 25 insertions(+), 9 deletions(-)
diff --git a/target/ppc/helper.h b/target/ppc/helper.h
index 627811cefc..ca893e1232 100644
--- a/target/ppc/helper.h
+++ b/target/ppc/helper.h
@@ -100,6 +100,10 @@ DEF_HELPER_4(fmadd, i64, env, i64, i64, i64)
DEF_HELPER_4(fmsub, i64, env, i64, i64, i64)
DEF_HELPER_4(fnmadd, i64, env, i64, i64, i64)
DEF_HELPER_4(fnmsub, i64, env, i64, i64, i64)
+DEF_HELPER_4(fmadds, i64, env, i64, i64, i64)
+DEF_HELPER_4(fmsubs, i64, env, i64, i64, i64)
+DEF_HELPER_4(fnmadds, i64, env, i64, i64, i64)
+DEF_HELPER_4(fnmsubs, i64, env, i64, i64, i64)
DEF_HELPER_2(fsqrt, f64, env, f64)
DEF_HELPER_2(fre, i64, env, i64)
DEF_HELPER_2(fres, i64, env, i64)
diff --git a/target/ppc/fpu_helper.c b/target/ppc/fpu_helper.c
index 7b4407e189..5caeed2c45 100644
--- a/target/ppc/fpu_helper.c
+++ b/target/ppc/fpu_helper.c
@@ -657,10 +657,25 @@ static float64 do_fmadd(CPUPPCState *env, float64 a,
float64 b,
return ret;
}
+static uint64_t do_fmadds(CPUPPCState *env, float64 a, float64 b,
+ float64 c, int madd_flags, uintptr_t retaddr)
+{
+ float64 ret = float64r32_muladd(a, b, c, madd_flags, &env->fp_status);
+ int flags = get_float_exception_flags(&env->fp_status);
+
+ if (unlikely(flags & float_flag_invalid)) {
+ float_invalid_op_madd(env, flags, 1, retaddr);
+ }
+ return ret;
+}
+
#define FPU_FMADD(op, madd_flags) \
uint64_t helper_##op(CPUPPCState *env, uint64_t arg1, \
uint64_t arg2, uint64_t arg3) \
- { return do_fmadd(env, arg1, arg2, arg3, madd_flags, GETPC()); }
+ { return do_fmadd(env, arg1, arg2, arg3, madd_flags, GETPC()); } \
+ uint64_t helper_##op##s(CPUPPCState *env, uint64_t arg1, \
+ uint64_t arg2, uint64_t arg3) \
+ { return do_fmadds(env, arg1, arg2, arg3, madd_flags, GETPC()); }
#define MADD_FLGS 0
#define MSUB_FLGS float_muladd_negate_c
diff --git a/target/ppc/translate/fp-impl.c.inc
b/target/ppc/translate/fp-impl.c.inc
index aad97a12e8..b1af4bef61 100644
--- a/target/ppc/translate/fp-impl.c.inc
+++ b/target/ppc/translate/fp-impl.c.inc
@@ -31,7 +31,7 @@ static void gen_set_cr1_from_fpscr(DisasContext *ctx)
#endif
/*** Floating-Point arithmetic ***/
-#define _GEN_FLOAT_ACB(name, op, op1, op2, isfloat, set_fprf, type) \
+#define _GEN_FLOAT_ACB(name, op1, op2, set_fprf, type) \
static void gen_f##name(DisasContext *ctx) \
{ \
TCGv_i64 t0; \
@@ -50,10 +50,7 @@ static void gen_f##name(DisasContext *ctx)
\
get_fpr(t0, rA(ctx->opcode)); \
get_fpr(t1, rC(ctx->opcode)); \
get_fpr(t2, rB(ctx->opcode)); \
- gen_helper_f##op(t3, cpu_env, t0, t1, t2); \
- if (isfloat) { \
- gen_helper_frsp(t3, cpu_env, t3); \
- } \
+ gen_helper_f##name(t3, cpu_env, t0, t1, t2); \
set_fpr(rD(ctx->opcode), t3); \
if (set_fprf) { \
gen_compute_fprf_float64(t3); \
@@ -68,8 +65,8 @@ static void gen_f##name(DisasContext *ctx)
\
}
#define GEN_FLOAT_ACB(name, op2, set_fprf, type) \
-_GEN_FLOAT_ACB(name, name, 0x3F, op2, 0, set_fprf, type); \
-_GEN_FLOAT_ACB(name##s, name, 0x3B, op2, 1, set_fprf, type);
+_GEN_FLOAT_ACB(name, 0x3F, op2, set_fprf, type); \
+_GEN_FLOAT_ACB(name##s, 0x3B, op2, set_fprf, type);
#define _GEN_FLOAT_AB(name, op, op1, op2, inval, isfloat, set_fprf, type) \
static void gen_f##name(DisasContext *ctx) \
@@ -233,7 +230,7 @@ static void gen_frsqrtes(DisasContext *ctx)
}
/* fsel */
-_GEN_FLOAT_ACB(sel, sel, 0x3F, 0x17, 0, 0, PPC_FLOAT_FSEL);
+_GEN_FLOAT_ACB(sel, 0x3F, 0x17, 0, PPC_FLOAT_FSEL);
/* fsub - fsubs */
GEN_FLOAT_AB(sub, 0x14, 0x000007C0, 1, PPC_FLOAT);
/* Optional: */
--
2.25.1
- [PATCH 17/35] target/ppc: Clean up do_fri, (continued)
- [PATCH 17/35] target/ppc: Clean up do_fri, Richard Henderson, 2021/11/19
- [PATCH 18/35] target/ppc: Update fmadd for new flags, Richard Henderson, 2021/11/19
- [PATCH 20/35] target/ppc: Do not call do_float_check_status from do_fmadd, Richard Henderson, 2021/11/19
- [PATCH 21/35] target/ppc: Split out do_frsp, Richard Henderson, 2021/11/19
- [PATCH 22/35] target/ppc: Update do_frsp for new flags, Richard Henderson, 2021/11/19
- [PATCH 23/35] target/ppc: Use helper_todouble in do_frsp, Richard Henderson, 2021/11/19
- [PATCH 24/35] target/ppc: Update sqrt for new flags, Richard Henderson, 2021/11/19
- [PATCH 25/35] target/ppc: Update xsrqpi and xsrqpxp to new flags, Richard Henderson, 2021/11/19
- [PATCH 26/35] target/ppc: Update fre to new flags, Richard Henderson, 2021/11/19
- [PATCH 27/35] softfloat: Add float64r32 arithmetic routines, Richard Henderson, 2021/11/19
- [PATCH 28/35] target/ppc: Add helpers for fmadds et al,
Richard Henderson <=
- [PATCH 29/35] target/ppc: Add helper for fsqrts, Richard Henderson, 2021/11/19
- [PATCH 30/35] target/ppc: Add helpers for fadds, fsubs, fdivs, Richard Henderson, 2021/11/19
- [PATCH 35/35] test/tcg/ppc64le: Add float reference files, Richard Henderson, 2021/11/19
- Re: [PATCH 35/35] test/tcg/ppc64le: Add float reference files, Cédric Le Goater, 2021/11/21
- Re: [PATCH 35/35] test/tcg/ppc64le: Add float reference files, Richard Henderson, 2021/11/22
- Re: [PATCH 35/35] test/tcg/ppc64le: Add float reference files, Cédric Le Goater, 2021/11/22
- Re: [PATCH 35/35] test/tcg/ppc64le: Add float reference files, Richard Henderson, 2021/11/22
- Re: [PATCH 35/35] test/tcg/ppc64le: Add float reference files, Cédric Le Goater, 2021/11/22
- Re: [PATCH 35/35] test/tcg/ppc64le: Add float reference files, Richard Henderson, 2021/11/22
- Re: [PATCH 35/35] test/tcg/ppc64le: Add float reference files, Cédric Le Goater, 2021/11/24