target/arm: convert conversion helpers to fpst/ahp_flag

Instead of passing env and leaving it up to the helper to get the
right fpstatus we pass it explicitly. There was already a get_fpstatus
helper for neon for the 32 bit code. We also add an get_ahp_flag() for
passing the state of the alternative FP16 format flag. This leaves
scope for later tracking the AHP state in translation flags.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/target/arm/translate.h b/target/arm/translate.h
index 37a1bba056..45f04244be 100644
--- a/target/arm/translate.h
+++ b/target/arm/translate.h
@@ -177,4 +177,16 @@ void arm_free_cc(DisasCompare *cmp);
 void arm_jump_cc(DisasCompare *cmp, TCGLabel *label);
 void arm_gen_test_cc(int cc, TCGLabel *label);
 
+/* Return state of Alternate Half-precision flag, caller frees result */
+static inline TCGv_i32 get_ahp_flag(void)
+{
+    TCGv_i32 ret = tcg_temp_new_i32();
+
+    tcg_gen_ld_i32(ret, cpu_env,
+                   offsetof(CPUARMState, vfp.xregs[ARM_VFP_FPSCR]));
+    tcg_gen_extract_i32(ret, ret, 26, 1);
+
+    return ret;
+}
+
 #endif /* TARGET_ARM_TRANSLATE_H */