Mesa (master): tgsi/scan: add support to figure out max nesting depth
Rob Clark
robclark at kemper.freedesktop.org
Sun Sep 13 15:08:45 UTC 2015
Module: Mesa
Branch: master
Commit: 86358e949eaa13c075338901024d0e1009fa7e99
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=86358e949eaa13c075338901024d0e1009fa7e99
Author: Rob Clark <robclark at freedesktop.org>
Date: Wed Sep 9 18:28:55 2015 -0400
tgsi/scan: add support to figure out max nesting depth
Sometimes a useful thing for compilers (or, for example, tgsi_to_nir) to
know. And pretty trivial for scan to figure this out for us.
Signed-off-by: Rob Clark <robclark at freedesktop.org>
Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>
Reviewed-by: Brian Paul <brianp at vmware.com>
---
src/gallium/auxiliary/tgsi/tgsi_scan.c | 16 ++++++++++++++++
src/gallium/auxiliary/tgsi/tgsi_scan.h | 5 +++++
2 files changed, 21 insertions(+)
diff --git a/src/gallium/auxiliary/tgsi/tgsi_scan.c b/src/gallium/auxiliary/tgsi/tgsi_scan.c
index 9810b54..66306d7 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_scan.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_scan.c
@@ -56,6 +56,7 @@ tgsi_scan_shader(const struct tgsi_token *tokens,
{
uint procType, i;
struct tgsi_parse_context parse;
+ unsigned current_depth = 0;
memset(info, 0, sizeof(*info));
for (i = 0; i < TGSI_FILE_COUNT; i++)
@@ -100,6 +101,21 @@ tgsi_scan_shader(const struct tgsi_token *tokens,
assert(fullinst->Instruction.Opcode < TGSI_OPCODE_LAST);
info->opcode_count[fullinst->Instruction.Opcode]++;
+ switch (fullinst->Instruction.Opcode) {
+ case TGSI_OPCODE_IF:
+ case TGSI_OPCODE_UIF:
+ case TGSI_OPCODE_BGNLOOP:
+ current_depth++;
+ info->max_depth = MAX2(info->max_depth, current_depth);
+ break;
+ case TGSI_OPCODE_ENDIF:
+ case TGSI_OPCODE_ENDLOOP:
+ current_depth--;
+ break;
+ default:
+ break;
+ }
+
if (fullinst->Instruction.Opcode >= TGSI_OPCODE_F2D &&
fullinst->Instruction.Opcode <= TGSI_OPCODE_DSSG)
info->uses_doubles = true;
diff --git a/src/gallium/auxiliary/tgsi/tgsi_scan.h b/src/gallium/auxiliary/tgsi/tgsi_scan.h
index c5900bc..42539ee 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_scan.h
+++ b/src/gallium/auxiliary/tgsi/tgsi_scan.h
@@ -113,6 +113,11 @@ struct tgsi_shader_info
unsigned indirect_files_written;
unsigned properties[TGSI_PROPERTY_COUNT]; /* index with TGSI_PROPERTY_ */
+
+ /**
+ * Max nesting limit of loops/if's
+ */
+ unsigned max_depth;
};
extern void
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