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This patch add correct vector addition and substraction intrisics when using Altivec with PPC. Current code uses default path and LLVM backend ends up issuing carry-out arithmetic instruction while it is expected saturated ones. It also includes a fix for PowerPC where char are unsigned by default, resulting in bogus values for vector shifting. Reviewed-by: Roland Scheidegger <sroland@vmware.com> Reviewed-by: Jose Fonseca <jfonseca@vmware.com>
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