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gallivm: simpler uint8->float conversions

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LLVM seems to finds it easier to reason about these than our
mantissa-manipulation code.
This commit is contained in:
Keith Whitwell 2010-10-06 19:09:03 +01:00
parent c79f162367
commit 2ef6f75ab4
1 changed files with 10 additions and 0 deletions
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10
src/gallium/auxiliary/gallivm/lp_bld_conv.c
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@ -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);