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authorMichal Krol <[email protected]>2009-07-30 10:12:09 +0200
committerMichal Krol <[email protected]>2009-07-30 10:14:17 +0200
commitb724dd28e24ec1c38af1082f5e16cd9a12d1653d (patch)
tree693b593319ddf454a7de74d755c23daa1237cff3 /src/gallium/auxiliary/tgsi/tgsi-instruction-set.txt
parent3e2b6a204966b962c9881e90fe3f0b74cf84d8c4 (diff)
tgsi: Document LOOP/ENDLOOP instruction operation.
Diffstat (limited to 'src/gallium/auxiliary/tgsi/tgsi-instruction-set.txt')
-rw-r--r--src/gallium/auxiliary/tgsi/tgsi-instruction-set.txt20
1 files changed, 18 insertions, 2 deletions
diff --git a/src/gallium/auxiliary/tgsi/tgsi-instruction-set.txt b/src/gallium/auxiliary/tgsi/tgsi-instruction-set.txt
index a3f4947c734..5f88cc2acac 100644
--- a/src/gallium/auxiliary/tgsi/tgsi-instruction-set.txt
+++ b/src/gallium/auxiliary/tgsi/tgsi-instruction-set.txt
@@ -667,7 +667,16 @@ TGSI Instruction Specification
1.9.8 LOOP - Loop
- TBD
+ dst.x = floor(src.x)
+ dst.y = floor(src.y)
+ dst.z = floor(src.z)
+
+ if (dst.y <= 0)
+ pc = [matching ENDLOOP] + 1
+ endif
+
+ Note: The destination must be a loop register.
+ The source must be a constant register.
1.9.9 REP - Repeat
@@ -687,7 +696,14 @@ TGSI Instruction Specification
1.9.12 ENDLOOP - End Loop
- TBD
+ dst.x = dst.x + dst.z
+ dst.y = dst.y - 1.0
+
+ if (dst.y > 0)
+ pc = [matching LOOP instruction] + 1
+ endif
+
+ Note: The destination must be a loop register.
1.9.13 ENDREP - End Repeat