[Qemu-devel] [PULL 05/26] target/ppc: Tidy helper_fmul

[David Gibson <david@gibson.dropbear.id.au>]

From: Richard Henderson <richard.henderson@linaro.org>

Tidy the invalid exception checking so that we rely on softfloat for
initial argument validation, and select the kind of invalid operand
exception only when we know we must.  Pass and return float64 values
directly rather than bounce through the CPU_DoubleU union.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 target/ppc/fpu_helper.c | 25 +++++++++++--------------
 target/ppc/helper.h     |  2 +-
 2 files changed, 12 insertions(+), 15 deletions(-)

diff --git a/target/ppc/fpu_helper.c b/target/ppc/fpu_helper.c
index c20b9ae672..b9ee46eb5f 100644
--- a/target/ppc/fpu_helper.c
+++ b/target/ppc/fpu_helper.c
@@ -635,27 +635,24 @@ uint64_t helper_fsub(CPUPPCState *env, uint64_t arg1, uint64_t arg2)
 }
 
 /* fmul - fmul. */
-uint64_t helper_fmul(CPUPPCState *env, uint64_t arg1, uint64_t arg2)
+float64 helper_fmul(CPUPPCState *env, float64 arg1, float64 arg2)
 {
-    CPU_DoubleU farg1, farg2;
-
-    farg1.ll = arg1;
-    farg2.ll = arg2;
+    float64 ret = float64_mul(arg1, arg2, &env->fp_status);
+    int status = get_float_exception_flags(&env->fp_status);
 
-    if (unlikely((float64_is_infinity(farg1.d) && float64_is_zero(farg2.d)) ||
-                 (float64_is_zero(farg1.d) && float64_is_infinity(farg2.d)))) {
-        /* Multiplication of zero by infinity */
-        farg1.ll = float_invalid_op_excp(env, POWERPC_EXCP_FP_VXIMZ, 1);
-    } else {
-        if (unlikely(float64_is_signaling_nan(farg1.d, &env->fp_status) ||
-                     float64_is_signaling_nan(farg2.d, &env->fp_status))) {
+    if (unlikely(status & float_flag_invalid)) {
+        if ((float64_is_infinity(arg1) && float64_is_zero(arg2)) ||
+            (float64_is_zero(arg1) && float64_is_infinity(arg2))) {
+            /* Multiplication of zero by infinity */
+            float_invalid_op_excp(env, POWERPC_EXCP_FP_VXIMZ, 1);
+        } else if (float64_is_signaling_nan(arg1, &env->fp_status) ||
+                   float64_is_signaling_nan(arg2, &env->fp_status)) {
             /* sNaN multiplication */
             float_invalid_op_excp(env, POWERPC_EXCP_FP_VXSNAN, 1);
         }
-        farg1.d = float64_mul(farg1.d, farg2.d, &env->fp_status);
     }
 
-    return farg1.ll;
+    return ret;
 }
 
 /* fdiv - fdiv. */
diff --git a/target/ppc/helper.h b/target/ppc/helper.h
index 1c453fa0f7..e4f7c55db9 100644
--- a/target/ppc/helper.h
+++ b/target/ppc/helper.h
@@ -87,7 +87,7 @@ DEF_HELPER_2(frim, i64, env, i64)
 
 DEF_HELPER_3(fadd, i64, env, i64, i64)
 DEF_HELPER_3(fsub, i64, env, i64, i64)
-DEF_HELPER_3(fmul, i64, env, i64, i64)
+DEF_HELPER_3(fmul, f64, env, f64, f64)
 DEF_HELPER_3(fdiv, f64, env, f64, f64)
 DEF_HELPER_4(fmadd, i64, env, i64, i64, i64)
 DEF_HELPER_4(fmsub, i64, env, i64, i64, i64)
-- 
2.17.1