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Re: [PATCH, middle-end/RTL, i386]: Simplify nested VEC_SELECT RTX
Andrew Pinski wrote:
This patch optimizes VEC_SELECT nested RTL expressions (with optional
VEC_CONCAT), when top VEC_SELECT extracts scalar operand.
One comment, could you add a comment before:
+ if (GET_CODE (trueop0) == VEC_SELECT)
Explaining what is going to be tried to be folded?
Sure. Something like this?
/* Extract a scalar element from a nested VEC_SELECT expression
(with optional nested VEC_CONCAT expression). Some targets
(i386) extract scalar element from a vector using chain of
nested VEC_SELECT expressions. When input operand is a memory
operand, this operation can be simplified to a simple scalar
load from an offseted memory address. */
if (GET_CODE (trueop0) == VEC_SELECT)