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Given recent changes to the dot_prod standard pattern name, this patch
fixes the arm back-end by implementing the following changes:
1. Add 2nd mode to all patterns relating to the dot-product in .md
files.
2. redirect the single-mode CODE_FOR_neon_(u|s|us)dot<mode> values
generated from `arm_neon_builtins.def' to their new 2-mode
equivalents via means of simple aliases, as per the following example:
constexpr insn_code CODE_FOR_neon_sdotv8qi
= CODE_FOR_neon_sdotv2siv8qi;
gcc/ChangeLog:
* config/arm/neon.md (<sup>dot_prod<vsi2qi>): Renamed to...
(<sup>dot_prod<mode><vsi2qi>): ...this.
(neon_<sup>dot<vsi2qi>): Renamed to...
(neon_<sup>dot<mode><vsi2qi>): ...this.
(neon_usdot<vsi2qi>): Renamed to...
(neon_usdot<mode><vsi2qi>): ...this.
(usdot_prod<vsi2qi>): Renamed to...
(usdot_prod<mode><vsi2qi>): ...this.
* config/arm/arm-builtins.cc
(CODE_FOR_neon_sdotv8qi): Definie as alias to
new CODE_FOR_neon_sdotv2siv8qi.
(CODE_FOR_neon_udotv8qi): Definie as alias to
new CODE_FOR_neon_udotv2siv8qi.
(CODE_FOR_neon_usdotv8qi): Definie as alias to
new CODE_FOR_neon_usdotv2siv8qi.
(CODE_FOR_neon_sdotv16qi): Definie as alias to
new CODE_FOR_neon_sdotv4siv16qi.
(CODE_FOR_neon_udotv16qi): Definie as alias to
new CODE_FOR_neon_udotv4siv16qi.
(CODE_FOR_neon_usdotv16qi): Definie as alias to
new CODE_FOR_neon_usdotv4siv16qi.
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