Hi,

As PR101596 showed, vect_recog_mulhs_pattern uses target_precision to
check the scale_term is expected or not, it could be wrong when the
precision of the actual used new_type larger than target_precision as
shown by the example.

This patch is to use precision of new_type instead of target_precision
for the scale_term matching check.

Bootstrapped & regtested on powerpc64le-linux-gnu P10,
powerpc64-linux-gnu P8, x86_64-redhat-linux and aarch64-linux-gnu.

Is it ok for trunk?

BR,
Kewen
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gcc/ChangeLog:

	PR tree-optimization/100696
	* tree-vect-patterns.c (vect_recog_mulhs_pattern): Fix wrong check
	by using new_type's precision instead.

gcc/testsuite/ChangeLog:

	PR tree-optimization/100696
	* gcc.target/powerpc/pr101596-1.c: New test.
	* gcc.target/powerpc/pr101596-2.c: Likewise.
	* gcc.target/powerpc/pr101596-3.c: Likewise.