From 591073be98300e1c07527af45c7c4ce8dff5bc39 Mon Sep 17 00:00:00 2001 From: Bernhard Schommer Date: Wed, 12 Sep 2018 14:32:01 +0200 Subject: Generate a nop instruction after some ais annotations (#137) * Generate a nop instruction after ais annotations. In order to prevent the merging of ais annotations with following Labels a nop instruction is inserted, but only if the annotation is followed immediately by a label. The insertion of nop instructions is performed during the expansion of builtin and pseudo assembler instructions and is processor independent, by inserting a __builtin_nop built-in. * Add Pnop instruction to ARM, RISC-V, and x86 ARM as well as RISC-V don't have nop instructions that can be easily encoded by for example add with zero instructions. For x86 we used to use `mov X0, X0` for nop but this may not be as efficient as the true nop instruction. * Implement __builtin_nop on all supported target architectures. This builtin is not yet made available on the C side for all architectures. Bug 24067 --- powerpc/TargetPrinter.ml | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'powerpc/TargetPrinter.ml') diff --git a/powerpc/TargetPrinter.ml b/powerpc/TargetPrinter.ml index 3e11406c..d8b0ee4b 100644 --- a/powerpc/TargetPrinter.ml +++ b/powerpc/TargetPrinter.ml @@ -844,7 +844,7 @@ module Target (System : SYSTEM):TARGET = fprintf oc "%s annotation: %S\n" comment annot | 2 -> let lbl = new_label () in - fprintf oc "%a: " label lbl; + fprintf oc "%a:\n" label lbl; add_ais_annot lbl preg_annot "r1" (camlstring_of_coqstring txt) args | _ -> assert false end -- cgit