Hello!
Alpha assembler requires that matching "lda $29,0($29)
!gpdisp!NNN" always follow "ldah $29,0($26) !gpdisp!NNN".
However, when the compiler inserts trap insn, it (correctly) figures
out that $29 is unused, and removes "lda" from insn stream. Since ldah
is defined as unspec_volatile, it remains present.
The solution is to make trap insn dependent on register $29.
2016-05-18 Uros Bizjak <ubiz...@gmail.com>
PR target/71145
* config/alpha/alpha.md (trap): Add (use (reg:DI 29)).
(*exception_receiver_1): Return "#" for TARGET_EXPLICIT_RELOCS.
Patch was bootstrapped and regression tested on alpha-linux-gnu.
Commited to mainline and all release branches.
Uros.
Index: alpha.md
===================================================================
--- alpha.md (revision 236296)
+++ alpha.md (working copy)
@@ -3738,7 +3738,8 @@
;; BUGCHK is documented common to OSF/1 and VMS PALcode.
(define_insn "trap"
- [(trap_if (const_int 1) (const_int 0))]
+ [(trap_if (const_int 1) (const_int 0))
+ (use (reg:DI 29))]
""
"call_pal 0x81"
[(set_attr "type" "callpal")])
@@ -5157,7 +5158,7 @@
"TARGET_ABI_OSF"
{
if (TARGET_EXPLICIT_RELOCS)
- return "ldah $29,0($26)\t\t!gpdisp!%*\;lda $29,0($29)\t\t!gpdisp!%*";
+ return "#";
else
return "ldgp $29,0($26)";
}
