fcd482a2d0
For an extension operation like MOVWreg, if the operand is already extended, we optimize the second extension out. Usually a LoadReg of a proper type would come already extended, as a MOVW/MOVWU etc. instruction does. But for a LoadReg to a floating point register, the instruction does not do the extension. So we cannot elide the extension. Updates #50671. Fixes #50682. Change-Id: Id8991df78d5acdecd3fd6138c558428cbd5f6ba3 Reviewed-on: https://go-review.googlesource.com/c/go/+/379236 Trust: Cherry Mui <cherryyz@google.com> Run-TryBot: Cherry Mui <cherryyz@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: David Chase <drchase@google.com> (cherry picked from commit d93ff73ae207763871bee38590242be968b2e743) Reviewed-on: https://go-review.googlesource.com/c/go/+/379515
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