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-rw-r--r--src/gallium/auxiliary/gallivm/lp_bld_conv.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_conv.c b/src/gallium/auxiliary/gallivm/lp_bld_conv.c
index ba51ff794f6..712ce5f92dc 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_conv.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_conv.c
@@ -266,17 +266,19 @@ lp_build_clamped_float_to_unsigned_norm(struct gallivm_state *gallivm,
else if (dst_width == (mantissa + 1)) {
/*
* The destination width matches exactly what can be represented in
- * floating point (i.e., mantissa + 1 bits). So do a straight
- * multiplication followed by casting. No further rounding is necessary.
+ * floating point (i.e., mantissa + 1 bits). Even so correct rounding
+ * still needs to be applied (only for numbers in [0.5-1.0] would
+ * conversion using truncation after scaling be sufficient).
*/
-
double scale;
+ struct lp_build_context uf32_bld;
+ lp_build_context_init(&uf32_bld, gallivm, src_type);
scale = (double)((1ULL << dst_width) - 1);
res = LLVMBuildFMul(builder, src,
lp_build_const_vec(gallivm, src_type, scale), "");
- res = LLVMBuildFPToSI(builder, res, int_vec_type, "");
+ res = lp_build_iround(&uf32_bld, res);
}
else {
/*