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Two new 32-bit signed and unsigned variants of S_MUL were added in gfx900 which operate similar to S_MUL expect they shift the product by 32 bits after multiplication. Tested with Histogram HIP-Sample and b+tree in rodinia 3.0 HIP port. Change-Id: I1bed32b17ccda7aa47f3b59528eb3304912d3610 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/58473 Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com> Maintainer: Matt Sinclair <mattdsinclair@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>