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[PATCH, middle-end]: FIX PR41930, cc1 SEGV compiling maxval_r16.c

From: Uros Bizjak <ubizjak at gmail dot com>
To: GCC Patches <gcc-patches at gcc dot gnu dot org>
Date: Wed, 11 Nov 2009 20:35:47 +0100
Subject: [PATCH, middle-end]: FIX PR41930, cc1 SEGV compiling maxval_r16.c

Hello!

Attached patch fixes bootstrap on alpha. As explained in the PR, simplify_replace_fn_rtx gets called with argument x in the form of:

(expr_list:REG_DEP_TRUE (symbol_ref:DI ("_OtsGeqX") [flags 0x41])
    (expr_list:REG_DEP_TRUE (mem:TF (reg/f:DI 75 [ array_3(D)->data ]) [3 S16 A128])
        (expr_list:REG_DEP_TRUE (reg:TF 76)
            (nil))))

Processing of this RTX recurses down to (nil) and this breaks compilation.

2009-11-11 Uros Bizjak <ubizjak@gmail.com>

    PR middle-end/41930
    * simplify-rtx.c (simplify_replace_fn_rtx) <case 'e'>: Skip
    processing if XEXP (x, i) is NULL.

Patch was bootstrapped and regression tested on x86_64-pc-linux-gnu and alphaev68-unknown-linux-gnu where it fixes bootstrap failure.

OK for mainline?

Uros.

Attachment: p.diff.txt
Description: Text document

Follow-Ups:
- Re: [PATCH, middle-end]: FIX PR41930, cc1 SEGV compiling maxval_r16.c
  - From: Richard Guenther

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