Commit 07fe4af4 by Segher Boessenkool

rs6000: Add back some w* constraints (PR91886)

In May and June last year I deleted many of our (vector) constraints.
We can now just use "wa" for those, together with some other
conditions, which can be per alternative using the "enabled" attribute
(which in turn primarily uses the "isa" attribute).

But, it turns out that Clang implements some of those constraints as
well, and at least musl uses some of them.  It is easy for us to add
those contraints back (as undocumented aliases to "wa", which always
did mean the same thing for valid inline assembler code), so do that.

gcc/
	* config/rs6000/constraints.md (wd, wf, wi, ws, ww): New undocumented
	aliases for "wa".
parent 529ea7d9
2020-03-18 Segher Boessenkool <segher@kernel.crashing.org>
* config/rs6000/constraints.md (wd, wf, wi, ws, ww): New undocumented
aliases for "wa".
2020-03-12 Richard Sandiford <richard.sandiford@arm.com>
PR rtl-optimization/90275
......
......@@ -45,6 +45,17 @@
FPR (@code{vs0}@dots{}@code{vs31} are @code{f0}@dots{}@code{f31}) or a VR
(@code{vs32}@dots{}@code{vs63} are @code{v0}@dots{}@code{v31}).")
(define_register_constraint "wd" "rs6000_constraints[RS6000_CONSTRAINT_wa]"
"@internal A compatibility alias for @code{wa}.")
(define_register_constraint "wf" "rs6000_constraints[RS6000_CONSTRAINT_wa]"
"@internal A compatibility alias for @code{wa}.")
(define_register_constraint "wi" "rs6000_constraints[RS6000_CONSTRAINT_wa]"
"@internal A compatibility alias for @code{wa}.")
(define_register_constraint "ws" "rs6000_constraints[RS6000_CONSTRAINT_wa]"
"@internal A compatibility alias for @code{wa}.")
(define_register_constraint "ww" "rs6000_constraints[RS6000_CONSTRAINT_wa]"
"@internal A compatibility alias for @code{wa}.")
(define_register_constraint "h" "SPECIAL_REGS"
"@internal A special register (@code{vrsave}, @code{ctr}, or @code{lr}).")
......
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