From aa360dd1c882b943066ba088861c0bfac9df930d Mon Sep 17 00:00:00 2001 From: Jozef Lawrynowicz Date: Tue, 21 Jul 2020 17:24:03 +0100 Subject: [PATCH] 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. --- gcc/config/msp430/msp430.md | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/gcc/config/msp430/msp430.md b/gcc/config/msp430/msp430.md index b6602fbca66..99299bd70ef 100644 --- 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 -- 2.30.2