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nir/spirv/cfg: Detect switch_break after loop_break/continue

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While the current CFG code is valid in the case where a switch break also
happens to be a loop continue, it's a bit suboptimal.  Since hardware is
capable of handling the continue as a direct jump, it's better to use a
continue instruction when we can than to bother with all of the nasty
switch break lowering.

Signed-off-by: Jason Ekstrand <jason@jlekstrand.net>
Cc: "12.0" <mesa-stable@lists.freedesktop.org>
(cherry picked from commit ef3c5ac7fb)
This commit is contained in:
Jason Ekstrand 2016-09-16 22:04:57 -07:00 • committed by Emil Velikov
parent 12d09e24f8
commit 5e4aeeb8ec
1 changed files with 2 additions and 2 deletions
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4
src/compiler/spirv/vtn_cfg.c
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@ -239,12 +239,12 @@ vtn_get_branch_type(struct vtn_block *block,
swcase->fallthrough == block->switch_case);
swcase->fallthrough = block->switch_case;
return vtn_branch_type_switch_fallthrough;
} else if (block == switch_break) {
return vtn_branch_type_switch_break;
} else if (block == loop_break) {
return vtn_branch_type_loop_break;
} else if (block == loop_cont) {
return vtn_branch_type_loop_continue;
} else if (block == switch_break) {
return vtn_branch_type_switch_break;
} else {
return vtn_branch_type_none;
}