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tcg/optimize: improve known-zero bits for 32-bit ops
The shl_i32 op might set some bits of the unused 32 high bits of the mask. Fix that by clearing the unused 32 high bits for all 32-bit ops except load/store which operate on tl values. Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net> Signed-off-by: Richard Henderson <rth@twiddle.net>
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