From: Keith Whitwell <keithw@vmware.com>
Date: Wed, 6 Oct 2010 18:09:03 +0000 (+0100)
Subject: gallivm: simpler uint8->float conversions
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=2ef6f75ab410bb188e028024e18891d7877febad;p=mesa.git

gallivm: simpler uint8->float conversions

LLVM seems to finds it easier to reason about these than our
mantissa-manipulation code.
---

diff --git a/src/gallium/auxiliary/gallivm/lp_bld_conv.c b/src/gallium/auxiliary/gallivm/lp_bld_conv.c
index 3abb19272b6..20aa2577830 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_conv.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_conv.c
@@ -178,6 +178,16 @@ lp_build_unsigned_norm_to_float(LLVMBuilderRef builder,
 
    assert(dst_type.floating);
 
+   /* Special-case int8->float, though most cases could be handled
+    * this way:
+    */
+   if (src_width == 8) {
+      scale = 1.0/255.0;
+      res = LLVMBuildSIToFP(builder, src, vec_type, "");
+      res = LLVMBuildFMul(builder, res, lp_build_const_vec(dst_type, scale), "");
+      return res;
+   }
+
    mantissa = lp_mantissa(dst_type);
 
    n = MIN2(mantissa, src_width);