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2012-03-06  Ulrich Weigand  <ulrich.weigand@linaro.org>

	Backport from mainline:

	gcc/
	* config/arm/arm.c (arm_sat_operator_match): New function.
	* config/arm/arm-protos.h (arm_sat_operator_match): Add prototype.
	* config/arm/arm.md ("insn" attribute): Add "sat" value.
	("SAT", "SATrev"): New code iterators.
	("SATlo", "SAThi"): New code iterator attributes.
	("*satsi_<SAT:code>"): New pattern.
	("*satsi_<SAT:code>_shift"): Likewise.
	* config/arm/predicates.md (sat_shift_operator): New.

	gcc/testsuite/
	* gcc.target/arm/sat-1.c: New test.

=== modified file 'gcc/config/arm/arm-protos.h'
--- old/gcc/config/arm/arm-protos.h	2012-02-22 13:31:54 +0000
+++ new/gcc/config/arm/arm-protos.h	2012-02-29 14:29:56 +0000
@@ -104,6 +104,7 @@
 extern int symbol_mentioned_p (rtx);
 extern int label_mentioned_p (rtx);
 extern RTX_CODE minmax_code (rtx);
+extern bool arm_sat_operator_match (rtx, rtx, int *, bool *);
 extern int adjacent_mem_locations (rtx, rtx);
 extern bool gen_ldm_seq (rtx *, int, bool);
 extern bool gen_stm_seq (rtx *, int);

=== modified file 'gcc/config/arm/arm.c'
--- old/gcc/config/arm/arm.c	2012-03-06 11:01:55 +0000
+++ new/gcc/config/arm/arm.c	2012-03-06 13:24:25 +0000
@@ -9978,6 +9978,42 @@
     }
 }
 
+/* Match pair of min/max operators that can be implemented via usat/ssat.  */
+
+bool
+arm_sat_operator_match (rtx lo_bound, rtx hi_bound,
+			int *mask, bool *signed_sat)
+{
+  /* The high bound must be a power of two minus one.  */
+  int log = exact_log2 (INTVAL (hi_bound) + 1);
+  if (log == -1)
+    return false;
+
+  /* The low bound is either zero (for usat) or one less than the
+     negation of the high bound (for ssat).  */
+  if (INTVAL (lo_bound) == 0)
+    {
+      if (mask)
+        *mask = log;
+      if (signed_sat)
+        *signed_sat = false;
+
+      return true;
+    }
+
+  if (INTVAL (lo_bound) == -INTVAL (hi_bound) - 1)
+    {
+      if (mask)
+        *mask = log + 1;
+      if (signed_sat)
+        *signed_sat = true;
+
+      return true;
+    }
+
+  return false;
+}
+
 /* Return 1 if memory locations are adjacent.  */
 int
 adjacent_mem_locations (rtx a, rtx b)

=== modified file 'gcc/config/arm/arm.md'
--- old/gcc/config/arm/arm.md	2012-03-02 13:53:14 +0000
+++ new/gcc/config/arm/arm.md	2012-03-06 13:24:25 +0000
@@ -286,7 +286,7 @@
 ;; scheduling information.
 
 (define_attr "insn"
-        "mov,mvn,smulxy,smlaxy,smlalxy,smulwy,smlawx,mul,muls,mla,mlas,umull,umulls,umlal,umlals,smull,smulls,smlal,smlals,smlawy,smuad,smuadx,smlad,smladx,smusd,smusdx,smlsd,smlsdx,smmul,smmulr,smmla,umaal,smlald,smlsld,clz,mrs,msr,xtab,sdiv,udiv,other"
+        "mov,mvn,smulxy,smlaxy,smlalxy,smulwy,smlawx,mul,muls,mla,mlas,umull,umulls,umlal,umlals,smull,smulls,smlal,smlals,smlawy,smuad,smuadx,smlad,smladx,smusd,smusdx,smlsd,smlsdx,smmul,smmulr,smmla,umaal,smlald,smlsld,clz,mrs,msr,xtab,sdiv,udiv,sat,other"
         (const_string "other"))
 
 ; TYPE attribute is used to detect floating point instructions which, if
@@ -3424,6 +3424,60 @@
 		      (const_int 12)))]
 )
 
+(define_code_iterator SAT [smin smax])
+(define_code_iterator SATrev [smin smax])
+(define_code_attr SATlo [(smin "1") (smax "2")])
+(define_code_attr SAThi [(smin "2") (smax "1")])
+
+(define_insn "*satsi_<SAT:code>"
+  [(set (match_operand:SI 0 "s_register_operand" "=r")
+        (SAT:SI (SATrev:SI (match_operand:SI 3 "s_register_operand" "r")
+                           (match_operand:SI 1 "const_int_operand" "i"))
+                (match_operand:SI 2 "const_int_operand" "i")))]
+  "TARGET_32BIT && arm_arch6 && <SAT:CODE> != <SATrev:CODE>
+   && arm_sat_operator_match (operands[<SAT:SATlo>], operands[<SAT:SAThi>], NULL, NULL)"
+{
+  int mask;
+  bool signed_sat;
+  if (!arm_sat_operator_match (operands[<SAT:SATlo>], operands[<SAT:SAThi>],
+                               &mask, &signed_sat))
+    gcc_unreachable ();
+
+  operands[1] = GEN_INT (mask);
+  if (signed_sat)
+    return "ssat%?\t%0, %1, %3";
+  else
+    return "usat%?\t%0, %1, %3";
+}
+  [(set_attr "predicable" "yes")
+   (set_attr "insn" "sat")])
+
+(define_insn "*satsi_<SAT:code>_shift"
+  [(set (match_operand:SI 0 "s_register_operand" "=r")
+        (SAT:SI (SATrev:SI (match_operator:SI 3 "sat_shift_operator"
+                             [(match_operand:SI 4 "s_register_operand" "r")
+                              (match_operand:SI 5 "const_int_operand" "i")])
+                           (match_operand:SI 1 "const_int_operand" "i"))
+                (match_operand:SI 2 "const_int_operand" "i")))]
+  "TARGET_32BIT && arm_arch6 && <SAT:CODE> != <SATrev:CODE>
+   && arm_sat_operator_match (operands[<SAT:SATlo>], operands[<SAT:SAThi>], NULL, NULL)"
+{
+  int mask;
+  bool signed_sat;
+  if (!arm_sat_operator_match (operands[<SAT:SATlo>], operands[<SAT:SAThi>],
+                               &mask, &signed_sat))
+    gcc_unreachable ();
+
+  operands[1] = GEN_INT (mask);
+  if (signed_sat)
+    return "ssat%?\t%0, %1, %4%S3";
+  else
+    return "usat%?\t%0, %1, %4%S3";
+}
+  [(set_attr "predicable" "yes")
+   (set_attr "insn" "sat")
+   (set_attr "shift" "3")
+   (set_attr "type" "alu_shift")])
 
 ;; Shift and rotation insns
 

=== modified file 'gcc/config/arm/predicates.md'
--- old/gcc/config/arm/predicates.md	2012-02-22 13:31:54 +0000
+++ new/gcc/config/arm/predicates.md	2012-02-29 14:29:56 +0000
@@ -241,6 +241,15 @@
 			      || ((unsigned HOST_WIDE_INT) INTVAL (XEXP (op, 1))) < 32")))
        (match_test "mode == GET_MODE (op)")))
 
+;; True for shift operators which can be used with saturation instructions.
+(define_special_predicate "sat_shift_operator"
+  (and (ior (and (match_code "mult")
+                 (match_test "power_of_two_operand (XEXP (op, 1), mode)"))
+            (and (match_code "ashift,ashiftrt")
+                 (match_test "GET_CODE (XEXP (op, 1)) == CONST_INT
+                             && ((unsigned HOST_WIDE_INT) INTVAL (XEXP (op, 1)) < 32)")))
+       (match_test "mode == GET_MODE (op)")))
+
 ;; True for MULT, to identify which variant of shift_operator is in use.
 (define_special_predicate "mult_operator"
   (match_code "mult"))

=== added file 'gcc/testsuite/gcc.target/arm/sat-1.c'
--- old/gcc/testsuite/gcc.target/arm/sat-1.c	1970-01-01 00:00:00 +0000
+++ new/gcc/testsuite/gcc.target/arm/sat-1.c	2012-02-29 14:29:56 +0000
@@ -0,0 +1,64 @@
+/* { dg-do compile } */
+/* { dg-require-effective-target arm_arm_ok } */
+/* { dg-require-effective-target arm_arch_v6_ok } */
+/* { dg-options "-O2 -marm" } */
+/* { dg-add-options arm_arch_v6 } */
+
+
+static inline int sat1 (int a, int amin, int amax)
+{
+  if      (a < amin) return amin;
+  else if (a > amax) return amax;
+  else               return a;
+}
+
+static inline int sat2 (int a, int amin, int amax)
+{
+  if      (a > amax) return amax;
+  else if (a < amin) return amin;
+  else               return a;
+}
+
+int u1 (int x)
+{
+  return sat1 (x, 0, 63);
+}
+
+int us1 (int x)
+{
+  return sat1 (x >> 5, 0, 63);
+}
+
+int s1 (int x)
+{
+  return sat1 (x, -64, 63);
+}
+
+int ss1 (int x)
+{
+  return sat1 (x >> 5, -64, 63);
+}
+
+int u2 (int x)
+{
+  return sat2 (x, 0, 63);
+}
+
+int us2 (int x)
+{
+  return sat2 (x >> 5, 0, 63);
+}
+
+int s2 (int x)
+{
+  return sat2 (x, -64, 63);
+}
+
+int ss2 (int x)
+{
+  return sat2 (x >> 5, -64, 63);
+}
+
+/* { dg-final { scan-assembler-times "usat" 4 } } */
+/* { dg-final { scan-assembler-times "ssat" 4 } } */
+