V4, patch #7: Use PADDI to add 34-bit constants
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Message ID 20190919001255.GG28484@ibm-toto.the-meissners.org
State New
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Series
  • V4, patch #7: Use PADDI to add 34-bit constants
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Commit Message

Michael Meissner Sept. 19, 2019, 12:12 a.m. UTC
This patch now allows GCC to generate PADDI to add 34-bit constants.

I have done a bootstrap build with all of the patches applied, and there were
no regressions in the test suite.  After posting these patches, I will start a
job to build each set of patches in turn just to make sure there are no extra
warnings.

Can I commit this patch to the trunk?

2019-09-18  Michael Meissner  <meissner@linux.ibm.com>

	* config/rs6000/predicates.md (add_operand): Add support for
	PADDI.
	* config/rs6000/rs6000.md (add<mode>3): Add support for PADDI.

Patch
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Index: gcc/config/rs6000/predicates.md
===================================================================
--- gcc/config/rs6000/predicates.md	(revision 275911)
+++ gcc/config/rs6000/predicates.md	(working copy)
@@ -839,7 +839,8 @@  (define_special_predicate "indexed_addre
 (define_predicate "add_operand"
   (if_then_else (match_code "const_int")
     (match_test "satisfies_constraint_I (op)
-		 || satisfies_constraint_L (op)")
+		 || satisfies_constraint_L (op)
+		 || satisfies_constraint_eI (op)")
     (match_operand 0 "gpc_reg_operand")))
 
 ;; Return 1 if the operand is either a non-special register, or 0, or -1.
Index: gcc/config/rs6000/rs6000.md
===================================================================
--- gcc/config/rs6000/rs6000.md	(revision 275913)
+++ gcc/config/rs6000/rs6000.md	(working copy)
@@ -1760,15 +1760,17 @@  (define_expand "add<mode>3"
 })
 
 (define_insn "*add<mode>3"
-  [(set (match_operand:GPR 0 "gpc_reg_operand" "=r,r,r")
-	(plus:GPR (match_operand:GPR 1 "gpc_reg_operand" "%r,b,b")
-		  (match_operand:GPR 2 "add_operand" "r,I,L")))]
+  [(set (match_operand:GPR 0 "gpc_reg_operand" "=r,r,r,r")
+	(plus:GPR (match_operand:GPR 1 "gpc_reg_operand" "%r,b,b,b")
+		  (match_operand:GPR 2 "add_operand" "r,I,L,eI")))]
   ""
   "@
    add %0,%1,%2
    addi %0,%1,%2
-   addis %0,%1,%v2"
-  [(set_attr "type" "add")])
+   addis %0,%1,%v2
+   addi %0,%1,%2"
+  [(set_attr "type" "add")
+   (set_attr "isa" "*,*,*,fut")])
 
 (define_insn "*addsi3_high"
   [(set (match_operand:SI 0 "gpc_reg_operand" "=b")