[Bug tree-optimization/92741] [10 Regression] ICE: verify_gimple failed (error: invalid vector types in nop conversion)

[rsandifo at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92741

--- Comment #6 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> 
---
Author: rsandifo
Date: Mon Dec  2 17:51:08 2019
New Revision: 278910

URL: https://gcc.gnu.org/viewcvs?rev=278910&root=gcc&view=rev
Log:
Tighten check for vector types in fold_convertible_p (PR 92741)

In this PR, IPA-CP was misled into using NOP_EXPR rather than
VIEW_CONVERT_EXPR to reinterpret a vector of 4 shorts as a vector
of 2 ints.  This tripped the tree-cfg.c assert I'd added in r278245.

2019-12-02  Richard Sandiford  <richard.sandif...@arm.com>

gcc/
        PR middle-end/92741
        * fold-const.c (fold_convertible_p): Check vector types more
        thoroughly.

gcc/testsuite/
        PR middle-end/92741
        * gcc.dg/pr92741.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/pr92741.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/fold-const.c
    trunk/gcc/testsuite/ChangeLog