MSP430: Define extendqipsi2

The SXT instruction extends the sign of the low byte of the operand
through the entire PSImode register.
SXTX.A can be used to sign extend the low byte of a memory operand
through to the 19th bit. Bits 31:20 are cleared.

gcc/ChangeLog:

	* config/msp430/msp430.md: New "extendqipsi2" define_insn.

diff --git a/gcc/config/msp430/msp430.md b/gcc/config/msp430/msp430.md
index b6602fbca66acab35e95795c56b9d5992a36af7b..99299bd70efa4026025ee2b34d744cce28441842 100644 (file)
--- a/gcc/config/msp430/msp430.md
+++ b/gcc/config/msp430/msp430.md
@@ -553,6 +553,15 @@
    SXT%X0\t%0"
 )
 
+(define_insn "extendqipsi2"
+  [(set (match_operand:PSI                0 "msp430_general_dst_operand" "=r,m")
+       (sign_extend:PSI (match_operand:QI 1 "msp430_general_operand" "0,0")))]
+  ""
+  "@
+  SXT\t%0
+  SXTX.A\t%0"
+)
+
 ;; ------------------------
 ;; ZERO EXTEND INSTRUCTIONS
 ;; Byte-writes to registers clear bits 19:8