[PATCH]: Revise gcse.c to handle parallels TRAP_IF and other RTL codes not handled by single_set

[John David Anglin <dave dot anglin at bell dot net>]

This patch fixes PR rtl-optimization/60155.

The PA backend has a number of INSN patterns which trap on signed  
overflow.  These are
implemented as parallels using the trap_if code.  Currently,  
single_set does not consider
a parallel with a trap_if rtx to be a single set.  This causes an ICE  
in gcse.c when an insn with
a trap_if is encountered.

The problem is fixed by implementing a gcse specific version of  
"single_set" which only
looks at whether there is a single non-dead set in an insn pattern.   
It allows multiple other
sets if they are dead.

Tested on hppa-unknown-linux-gnu, hppa2.0w-hp-hpux11.11 and hppa64-hp- 
hpux11.11.

OK for trunk?

Dave
--
John David Anglin	dave.anglin@bell.net

Attachment: gcse.c.d.7.txt
Description: Text document