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[PATCH, alpha]: Fix PR 71145: Error: No lda !gpdisp!278 was found

From: Uros Bizjak <ubizjak at gmail dot com>
To: "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
Date: Wed, 18 May 2016 21:32:11 +0200
Subject: [PATCH, alpha]: Fix PR 71145: Error: No lda !gpdisp!278 was found
Authentication-results: sourceware.org; auth=none

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  <ubizjak@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.

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