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target/arm: Handle FPCR.AH in SVE FABS

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Make SVE FABS honour the FPCR.AH "don't negate the sign of a NaN"
semantics.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Peter Maydell 2025-02-01 16:39:38 +00:00
parent 47d3216240
commit 4de25ed588
3 changed files with 18 additions and 1 deletions
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4
target/arm/tcg/helper-sve.h
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@ -541,6 +541,10 @@ DEF_HELPER_FLAGS_4(sve_fabs_h, TCG_CALL_NO_RWG, void, ptr, ptr, ptr, i32)
DEF_HELPER_FLAGS_4(sve_fabs_s, TCG_CALL_NO_RWG, void, ptr, ptr, ptr, i32)
DEF_HELPER_FLAGS_4(sve_fabs_d, TCG_CALL_NO_RWG, void, ptr, ptr, ptr, i32)
DEF_HELPER_FLAGS_4(sve_ah_fabs_h, TCG_CALL_NO_RWG, void, ptr, ptr, ptr, i32)
DEF_HELPER_FLAGS_4(sve_ah_fabs_s, TCG_CALL_NO_RWG, void, ptr, ptr, ptr, i32)
DEF_HELPER_FLAGS_4(sve_ah_fabs_d, TCG_CALL_NO_RWG, void, ptr, ptr, ptr, i32)
DEF_HELPER_FLAGS_4(sve_fneg_h, TCG_CALL_NO_RWG, void, ptr, ptr, ptr, i32)
DEF_HELPER_FLAGS_4(sve_fneg_s, TCG_CALL_NO_RWG, void, ptr, ptr, ptr, i32)
DEF_HELPER_FLAGS_4(sve_fneg_d, TCG_CALL_NO_RWG, void, ptr, ptr, ptr, i32)

8
target/arm/tcg/sve_helper.c
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@ -879,6 +879,14 @@ DO_ZPZ(sve_fabs_h, uint16_t, H1_2, DO_FABS)
DO_ZPZ(sve_fabs_s, uint32_t, H1_4, DO_FABS)
DO_ZPZ_D(sve_fabs_d, uint64_t, DO_FABS)
#define DO_AH_FABS_H(N) (float16_is_any_nan(N) ? (N) : DO_FABS(N))
#define DO_AH_FABS_S(N) (float32_is_any_nan(N) ? (N) : DO_FABS(N))
#define DO_AH_FABS_D(N) (float64_is_any_nan(N) ? (N) : DO_FABS(N))
DO_ZPZ(sve_ah_fabs_h, uint16_t, H1_2, DO_AH_FABS_H)
DO_ZPZ(sve_ah_fabs_s, uint32_t, H1_4, DO_AH_FABS_S)
DO_ZPZ_D(sve_ah_fabs_d, uint64_t, DO_AH_FABS_D)
#define DO_FNEG(N) (N ^ ~((__typeof(N))-1 >> 1))
DO_ZPZ(sve_fneg_h, uint16_t, H1_2, DO_FNEG)

7
target/arm/tcg/translate-sve.c
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@ -783,7 +783,12 @@ static gen_helper_gvec_3 * const fabs_fns[4] = {
NULL, gen_helper_sve_fabs_h,
gen_helper_sve_fabs_s, gen_helper_sve_fabs_d,
};
TRANS_FEAT(FABS, aa64_sve, gen_gvec_ool_arg_zpz, fabs_fns[a->esz], a, 0)
static gen_helper_gvec_3 * const fabs_ah_fns[4] = {
NULL, gen_helper_sve_ah_fabs_h,
gen_helper_sve_ah_fabs_s, gen_helper_sve_ah_fabs_d,
};
TRANS_FEAT(FABS, aa64_sve, gen_gvec_ool_arg_zpz,
s->fpcr_ah ? fabs_ah_fns[a->esz] : fabs_fns[a->esz], a, 0)
static gen_helper_gvec_3 * const fneg_fns[4] = {
NULL, gen_helper_sve_fneg_h,