gallivm: handle nan's in min/max

[mesa.git] / src / gallium / auxiliary / gallivm / lp_bld_arit.h

diff --git a/src/gallium/auxiliary/gallivm/lp_bld_arit.h b/src/gallium/auxiliary/gallivm/lp_bld_arit.h
index 04e180c94fdc2766c3c4a396ac47b1c79e924a05..14b3a164faa687159a7df837935b98176327dd4c 100644 (file)
--- a/src/gallium/auxiliary/gallivm/lp_bld_arit.h
+++ b/src/gallium/auxiliary/gallivm/lp_bld_arit.h
@@ -131,17 +131,43 @@ lp_build_lerp_3d(struct lp_build_context *bld,
                  LLVMValueRef v111,
                  unsigned flags);
 
+/**
+ * Specifies floating point NaN behavior.
+ */
+enum gallivm_nan_behavior {
+   /* Results are undefined with NaN. Results in fastest code */
+   GALLIVM_NAN_BEHAVIOR_UNDEFINED,
+   /* If input is NaN, NaN is returned */
+   GALLIVM_NAN_RETURN_NAN,
+   /* If one of the inputs is NaN, the other operand is returned */
+   GALLIVM_NAN_RETURN_OTHER,
+   /* If one of the inputs is NaN, the second operand is returned.
+    * In min/max it will be as fast as undefined with sse opcodes */
+   GALLIVM_NAN_RETURN_SECOND
+};
 
 LLVMValueRef
 lp_build_min(struct lp_build_context *bld,
              LLVMValueRef a,
              LLVMValueRef b);
 
+LLVMValueRef
+lp_build_min_ext(struct lp_build_context *bld,
+                 LLVMValueRef a,
+                 LLVMValueRef b,
+                 enum gallivm_nan_behavior nan_behavior);
+
 LLVMValueRef
 lp_build_max(struct lp_build_context *bld,
              LLVMValueRef a,
              LLVMValueRef b);
 
+LLVMValueRef
+lp_build_max_ext(struct lp_build_context *bld,
+                 LLVMValueRef a,
+                 LLVMValueRef b,
+                 enum gallivm_nan_behavior nan_behavior);
+
 LLVMValueRef
 lp_build_clamp(struct lp_build_context *bld,
                LLVMValueRef a,
@@ -309,4 +335,8 @@ lp_build_mod(struct lp_build_context *bld,
              LLVMValueRef x,
              LLVMValueRef y);
 
+LLVMValueRef
+lp_build_isnan(struct lp_build_context *bld,
+               LLVMValueRef x);
+
 #endif /* !LP_BLD_ARIT_H */