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Re: [tree-ssa] RFC: Never gimplify ASM_EXPRs
On Thu, Jun 05, 2003 at 01:30:53PM -0400, Diego Novillo wrote:
> Ignoring the ASM_EXPRs is simple, fool-proof and won't block any
> significant optimization opportunities. At the level that we are
> operating, we should not be concerning ourselves with such low level
> details. The same thing happens with machine-dependent builtins. I
> don't think we should even try to understand them.
I don't think we should go that far. If the *address* being
manipulated is too complex, then we're definitely losing out.
In particular, I would *strongly* disagree that we should not
gimplify an expression like
*(int *)foo(bar() + baz(boff()))
What we need is some mechanism to handle the difference between
those asm arguments that need lvalues and those that don't.
This recognition is already present in the existing expand_asm_operands,
we just need to re-format it into some form handy for the gimplifier.
r~