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authorAlex Bennée <alex.bennee@linaro.org>2014-03-17 16:31:53 +0000
committerPeter Maydell <peter.maydell@linaro.org>2014-03-17 16:31:53 +0000
commitc2fb418e35be3eb1f60987174f94c029f7d4dd7d (patch)
tree1ed62625c2e5f4dbc921662d9eb29d6523e6391e /target-arm/translate.c
parent5553955eb6ec890f324a2ff6c6cc1365b98b981f (diff)
downloadqemu-arm-c2fb418e35be3eb1f60987174f94c029f7d4dd7d.tar.gz
target-arm: A64: Add [UF]RSQRTE (reciprocal root estimate)
This adds support for [UF]RSQRTE instructions. It utilises the existing NEON helpers with some changes. The changes include an explicit passing of fpstatus (so the correct one is used between arm32 and aarch64), denormilzation, more correct error handling and also proper scaling of the fraction going into the estimate. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Richard Henderson <rth@twiddle.net> Message-id: 1394822294-14837-25-git-send-email-peter.maydell@linaro.org Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'target-arm/translate.c')
-rw-r--r--target-arm/translate.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/target-arm/translate.c b/target-arm/translate.c
index 3771953e02..56e3b4bf7f 100644
--- a/target-arm/translate.c
+++ b/target-arm/translate.c
@@ -6689,8 +6689,12 @@ static int disas_neon_data_insn(CPUARMState * env, DisasContext *s, uint32_t ins
break;
}
case NEON_2RM_VRSQRTE:
- gen_helper_rsqrte_u32(tmp, tmp, cpu_env);
+ {
+ TCGv_ptr fpstatus = get_fpstatus_ptr(1);
+ gen_helper_rsqrte_u32(tmp, tmp, fpstatus);
+ tcg_temp_free_ptr(fpstatus);
break;
+ }
case NEON_2RM_VRECPE_F:
{
TCGv_ptr fpstatus = get_fpstatus_ptr(1);
@@ -6699,8 +6703,12 @@ static int disas_neon_data_insn(CPUARMState * env, DisasContext *s, uint32_t ins
break;
}
case NEON_2RM_VRSQRTE_F:
- gen_helper_rsqrte_f32(cpu_F0s, cpu_F0s, cpu_env);
+ {
+ TCGv_ptr fpstatus = get_fpstatus_ptr(1);
+ gen_helper_rsqrte_f32(cpu_F0s, cpu_F0s, fpstatus);
+ tcg_temp_free_ptr(fpstatus);
break;
+ }
case NEON_2RM_VCVT_FS: /* VCVT.F32.S32 */
gen_vfp_sito(0, 1);
break;