This is the mail archive of the mailing list for the GCC project.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Commit: MSP430: Enhance the zero_extendhisi2 pattern

Hi Guys,

  I am applying the patch below to enhance the zero_extendhisi2 pattern
  in the MSP430 backend so that it can cope with separate source and
  destination registers.  This makes zero extending into another
  register more efficient and it also helps to work around a reload bug
  reported in PR 66156.


2015-05-19  Nick Clifton  <>

	PR target/66156
	* config/msp430/ (zero_extendhisi2): Add support for
	separate source and destination registers.

Index: gcc/config/msp430/
--- gcc/config/msp430/	(revision 223348)
+++ gcc/config/msp430/	(working copy)
@@ -588,10 +588,12 @@
 ;; patterns.  Doing these manually allows for alternate optimization
 ;; paths.
 (define_insn "zero_extendhisi2"
-  [(set (match_operand:SI 0 "nonimmediate_operand" "=rm")
-	(zero_extend:SI (match_operand:HI 1 "nonimmediate_operand" "0")))]
+  [(set (match_operand:SI 0 "nonimmediate_operand" "=rm,r")
+	(zero_extend:SI (match_operand:HI 1 "nonimmediate_operand" "0,r")))]
-  "MOV.W\t#0,%H0"
+  "@
+  MOV.W\t#0,%H0
+  MOV.W\t%1,%L0 { MOV.W\t#0,%H0"
 (define_insn "zero_extendhisipsi2"

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]