[Qemu-devel] [PATCH v2 15/19] target-ppc: fix SPE comparison functions

[Aurelien Jarno <aurelien@aurel32.net>]

efstst*() functions are fast SPE funtions which do not take into account
special values (infinites, NaN, etc.), while efscmp*() functions are
IEEE754 compliant.

Given that float32_*() functions are IEEE754 compliant, the efscmp*()
functions are correctly implemented, while efstst*() are not. This
patch reverse the implementation of this two groups of functions and
fix the comments. It also use float32_eq() instead of float32_eq_quiet()
as qNaNs should not be ignored.

Cc: Alexander Graf <agraf@suse.de>
Cc: Nathan Froyd <froydnj@codesourcery.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
---
 target-ppc/op_helper.c |   26 +++++++++++++-------------
 1 files changed, 13 insertions(+), 13 deletions(-)

v2: fix calls to efscmp*, removing an infinite loop


diff --git a/target-ppc/op_helper.c b/target-ppc/op_helper.c
index f645f57..9aa108e 100644
--- a/target-ppc/op_helper.c
+++ b/target-ppc/op_helper.c
@@ -3331,7 +3331,7 @@ HELPER_SPE_VECTOR_ARITH(fsmul);
 HELPER_SPE_VECTOR_ARITH(fsdiv);
 
 /* Single-precision floating-point comparisons */
-static inline uint32_t efststlt(uint32_t op1, uint32_t op2)
+static inline uint32_t efscmplt(uint32_t op1, uint32_t op2)
 {
     CPU_FloatU u1, u2;
     u1.l = op1;
@@ -3339,7 +3339,7 @@ static inline uint32_t efststlt(uint32_t op1, uint32_t op2)
     return float32_lt(u1.f, u2.f, &env->vec_status) ? 4 : 0;
 }
 
-static inline uint32_t efststgt(uint32_t op1, uint32_t op2)
+static inline uint32_t efscmpgt(uint32_t op1, uint32_t op2)
 {
     CPU_FloatU u1, u2;
     u1.l = op1;
@@ -3347,30 +3347,30 @@ static inline uint32_t efststgt(uint32_t op1, uint32_t op2)
     return float32_le(u1.f, u2.f, &env->vec_status) ? 0 : 4;
 }
 
-static inline uint32_t efststeq(uint32_t op1, uint32_t op2)
+static inline uint32_t efscmpeq(uint32_t op1, uint32_t op2)
 {
     CPU_FloatU u1, u2;
     u1.l = op1;
     u2.l = op2;
-    return float32_eq_quiet(u1.f, u2.f, &env->vec_status) ? 4 : 0;
+    return float32_eq(u1.f, u2.f, &env->vec_status) ? 4 : 0;
 }
 
-static inline uint32_t efscmplt(uint32_t op1, uint32_t op2)
+static inline uint32_t efststlt(uint32_t op1, uint32_t op2)
 {
-    /* XXX: TODO: test special values (NaN, infinites, ...) */
-    return efststlt(op1, op2);
+    /* XXX: TODO: ignore special values (NaN, infinites, ...) */
+    return efscmplt(op1, op2);
 }
 
-static inline uint32_t efscmpgt(uint32_t op1, uint32_t op2)
+static inline uint32_t efststgt(uint32_t op1, uint32_t op2)
 {
-    /* XXX: TODO: test special values (NaN, infinites, ...) */
-    return efststgt(op1, op2);
+    /* XXX: TODO: ignore special values (NaN, infinites, ...) */
+    return efscmpgt(op1, op2);
 }
 
-static inline uint32_t efscmpeq(uint32_t op1, uint32_t op2)
+static inline uint32_t efststeq(uint32_t op1, uint32_t op2)
 {
-    /* XXX: TODO: test special values (NaN, infinites, ...) */
-    return efststeq(op1, op2);
+    /* XXX: TODO: ignore special values (NaN, infinites, ...) */
+    return efscmpeq(op1, op2);
 }
 
 #define HELPER_SINGLE_SPE_CMP(name)                                           \
-- 
1.7.2.3