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msp430.md (zero_extendpsisi2): Use + constraint on operand 0 in order to prevent confusion about the number of...

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* config/msp430/msp430.md (zero_extendpsisi2): Use + constraint on
	operand 0 in order to prevent confusion about the number of
	registers involved.

From-SVN: r210636
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Nick Clifton 2014-05-20 09:38:00 +00:00 • committed by Nick Clifton
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gcc/ChangeLog
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@ -1,3 +1,9 @@
2014-05-20 Nick Clifton <nickc@redhat.com>
* config/msp430/msp430.md (zero_extendpsisi2): Use + constraint on
operand 0 in order to prevent confusion about the number of
registers involved.
2014-05-20 Richard Biener <rguenther@suse.de>
PR tree-optimization/61221

8
gcc/config/msp430/msp430.md
View file

@ -618,9 +618,15 @@
; when the PSI value is negative..
;
; Note: using PUSHM.A #1 is two bytes smaller than using PUSHX.A....
;
; Note: We use a + constraint on operand 0 as otherwise GCC gets confused
; about extending a single PSI mode register into a pair of SImode registers
; with the same starting register. It thinks that the upper register of
; the pair is unused and so it can clobber it. Try compiling 20050826-2.c
; at -O2 to see this.
(define_insn "zero_extendpsisi2"
[(set (match_operand:SI 0 "register_operand" "=r")
[(set (match_operand:SI 0 "register_operand" "+r")
(zero_extend:SI (match_operand:PSI 1 "register_operand" "r")))]
""
"*