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MSP430: Define extendqipsi2

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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.
This commit is contained in:
Jozef Lawrynowicz 2020-07-21 17:24:03 +01:00
parent 111afded7f
commit aa360dd1c8
1 changed files with 9 additions and 0 deletions
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9
gcc/config/msp430/msp430.md
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@ -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