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So combine (rightfully) produces:
(subreg:DD (vec_concat:V2DI (const_int -1 [0xffffffffffffffff])
(reg:DI 145 [ _22 ])) 0)
And then calls simplify_subreg on it.
simplify_subreg then sees it can remove the vec_concat as this is
the lower part and try to do `(subreg:DD (const_int -1 [0xffffffffffffffff]))`
but that is an invalid constant for DF64 so simplify_subreg rejects
that and returns NULL but there is code in simplify_subreg to create
a SUBREG then if the subreg validates. The problem is we are using DImode
for the inner mode and that validates but when gen_rtx_SUBREG is called
the inner mode of DImode is not there; only VOIDmode.
So the fix is to check for VOIDmode before the call to validate_subreg.
Bootstrapped and tested on x86_64-linux-gnu. And lightly tested for aarch64-linux-gnu.
PR rtl-optimization/123822
gcc/ChangeLog:
* simplify-rtx.cc (simplify_context::simplify_subreg): Check the
mode of the part to be non-VOIDmode before calling gen_rtx_SUBREG.
gcc/testsuite/ChangeLog:
* gcc.dg/torture/pr123822-1.c: New test.
Signed-off-by: Andrew Pinski <andrew.pinski@oss.qualcomm.com>
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