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authorEric Anholt <eric@anholt.net>2014-08-20 14:44:36 -0700
committerEric Anholt <eric@anholt.net>2014-08-22 10:16:57 -0700
commitc3c922289b2fb080ec184d9bd7e71a8870ced18d (patch)
tree761325ed6d90430442566eba465e36b4a08b4d4f
parent2ab4e48f9457159087c851f2230c1e642ea65802 (diff)
vc4: Fix FLR for integer values less than 0.
If we didn't truncate at all, then we don't need to fix for truncation happening in the wrong direction. Fixes piglit builtin-functions/*-floor-*
-rw-r--r--src/gallium/drivers/vc4/vc4_program.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/src/gallium/drivers/vc4/vc4_program.c b/src/gallium/drivers/vc4/vc4_program.c
index c11ee5aa1b1..9f59bdffe0c 100644
--- a/src/gallium/drivers/vc4/vc4_program.c
+++ b/src/gallium/drivers/vc4/vc4_program.c
@@ -431,8 +431,14 @@ tgsi_to_qir_flr(struct tgsi_to_qir *trans,
{
struct qcompile *c = trans->c;
struct qreg trunc = qir_ITOF(c, qir_FTOI(c, src[0 * 4 + i]));
+
+ /* This will be < 0 if we truncated and the truncation was of a value
+ * that was < 0 in the first place.
+ */
+ struct qreg diff = qir_FSUB(c, src[0 * 4 + i], trunc);
+
return qir_CMP(c,
- src[0 * 4 + i],
+ diff,
qir_FSUB(c, trunc, qir_uniform_f(trans, 1.0)),
trunc);
}